Arsenal will be without forward Alexandre Lacazette until October due to injury, but boss Unai Emery is more than happy to keep giving opportunities to the younger members of his squad.

Midfielder Joe Willock signed a new long-term contract with the Premier League club on Wednesday and he is one of many academy graduates to have featured under the Spaniard since he took charge last summer.

Forward Reiss Nelson, 19, is another to have earned a shot in the starting XI this season and Lacazette's ankle injury - revealed by the club after Emery's press conference - should present Nelson with more chances, starting with Sunday's clash at Watford.

"It's our philosophy and our idea to give them chances to be with us in training and taking confidence and playing minutes and if they achieve the performance we want, then continuing," Emery said, when asked about his young players.

"They can take experience being with us, training with us, playing with us and also helping them with our experienced players and sharing with those players our way."

Arsenal vs Tottenham player ratings Show all 22 1 /22 Arsenal vs Tottenham player ratings Arsenal vs Tottenham player ratings Bernd Leno - 5/10 Has been really good since replacing Petr Cech in net but today won’t be a day he looks back on fondly (on a personal level anyway). He should’ve done much better with Spurs’ equaliser and that goal cost Arsenal their momentum in the game. He did make some good stops, mind. AFP/Getty Images Arsenal vs Tottenham player ratings Shkodran Mustafi - 6 An uncomfortable performance from Mustafi. Always looks like he’s going to score a goal going forward but his defending is suspect and got too tight to Kane quite often. REUTERS Arsenal vs Tottenham player ratings Sokratis Papastathopoulos - 7 A slightly better performance than his central defensive partner but there’s not much in it, really. PA Arsenal vs Tottenham player ratings Rob Holding - 5 Much improved player but like Leno, a huge error in decision-making cost his side a goal. Slid in on Son for the second goal and despite the limited contact, it was a ridiculous tackle to make. Getty Images Arsenal vs Tottenham player ratings Hector Bellerin - 7 A threatening performance going forward and can’t really blame himself for anything defensively in the game. REUTERS Arsenal vs Tottenham player ratings Lucas Torreira - 8 He’s certainly what Arsenal have been missing for the last few years with a bit of grit and determination in the heart of midfield. Scored the fourth goal of the game which was an absolute beauty. AFP/Getty Images Arsenal vs Tottenham player ratings Granit Xhaka - 7 Strangely enough, Xhaka was a bit of a passenger and that’s unusual for him as he’s normally involved, one way or another. Didn’t make any errors either though so that’s got to be considered a good day. Getty Images Arsenal vs Tottenham player ratings Sead Kolasinac - 8 The Bosnian full back, like his Spanish counterpart on the right hand side, was fantastic. A constant menace to that Spurs back line and sent in some delightful crosses. Getty Images Arsenal vs Tottenham player ratings Henrikh Mkhitaryan - 7 He was one of the key reasons Arsenal came storming out of the blocks early in the first half but he slowly laboured and lost his impact on proceedings and was replaced at half time. REUTERS Arsenal vs Tottenham player ratings Pierre-Emerick Aubameyang - 9 Scored the penalty that gave Arsenal the lead and chased a lot of causes down both wings. Will be remembered for his second goal which was a little bit special. The curl on the ball and the way Lloris stood to watch it fly past was glorious. Assisted the fourth goal with a classy pass to put the icing on the cake. Action Images via Reuters Arsenal vs Tottenham player ratings Alex Iwobi - 5 The least threatening of the forward players and his decision making often let him down, too slow to react to potentially promising situations. Replaced at half time by Lacazette. REUTERS Arsenal vs Tottenham player ratings Hugo Lloris - 7 Made some crucial saves during Arsenal’s early onslaught and was quick to come off his line at the key times. Conceded four times but didn’t really deserve it. Getty Images Arsenal vs Tottenham player ratings Serge Aurier - 6 Was a physically distressed figure after the first 20 minutes and was taken apart on Arsenal’s left hand side. Improved as the match went on but always seems to be playing games on the edge. AP Arsenal vs Tottenham player ratings Juan Foyth - 5 Not brilliant himself and has been another player who plays on the edge, and always looks like making a rash decision. Nothing particularly bad this afternoon but the first 20 minutes were enough to wobble any defender. Improved in the second half with some key interceptions. REUTERS Arsenal vs Tottenham player ratings Jan Vertonghen - 4 Has reason to be rather unhappy with his return to the starting line up, giving a penalty away for a needless handball and simply being rather unnerving to watch at the back. Unusual for him. Arsenal rampant against him. Shown a red card with 5 minutes to go to top off a bad day. REUTERS Arsenal vs Tottenham player ratings Ben Davies - 6 Not a particular threat going forward but nor was he ripped to shreds like his fellow full back partner. Didn’t add too much to proceedings though, either. Taken off for Rose in the latter stages. AFP/Getty Images Arsenal vs Tottenham player ratings Eric Dier - 7 A typically gritty performance from Dier who received his customary yellow card but also scored a goal to silence to the Emirates. Sadly for him, it didn’t last. AFP/Getty Images Arsenal vs Tottenham player ratings Moussa Sissoko - 5 He’s one of Spurs’ most improved players recently but today wasn’t his finest. Struggled to dominate the midfield. Action Images via Reuters Arsenal vs Tottenham player ratings Christian Eriksen - 7 Set up the equaliser with a fabulous free-kick, curled in perfectly and low. Otherwise played some neat passes in key areas but fpund himself on the back foot for a lot of the game. PA Arsenal vs Tottenham player ratings Dele Alli - 5 Like Eriksen, struggled to really impose himself on the game, and unlike Eriksen, didn’t make a meaningful difference to proceedings but did get himself a yellow card. Getty Images Arsenal vs Tottenham player ratings Harry Kane - 6 Scored the penalty and potentially had a good 5 minutes in the game but rarely threatened the Arsenal goal. Getty Images Arsenal vs Tottenham player ratings Son Heung-min - 7 Won the penalty to give Spurs the halftime lead, as well as winning the free-kick that enabled them to equalise. However, he squandered a number of chances, too. Action Images via Reuters

He added: "Every player needs their first experience. For me it's training with us every day, giving them chances to show us first their spirit, then their wish and after their performance.

"We can analyse our pre-season, a lot of young players deserved to be with us and we can help them to be with us and take more minutes in the Premier League, cups and Europa League matches."

Emery confirmed club-record signing Nicolas Pepe should be available for the fixture at Vicarage Road, despite not going away with Ivory Coast on international duty.

The goalscoring onus will fall on the former Lille attacker and Real Madrid loanee Dani Cellebos - plus Pierre-Emerick Aubameyang - with Lacazette sidelined until October.

On Pepe, Emery said: "We decided to keep him here with us and we were working with him to have him ready for Sunday and we think he will be.

"We need people to be patient with him and also help him to be comfortable, to know us, to know the opposition teams.

"Each training and each match is very important to be ready and to achieve their (Pepe and Cellebos) performance. I really think the progress is perfect."

Arsenal are likely to come up against ex-player Danny Welbeck on Sunday, who joined Watford in August on a free transfer after five seasons at the Emirates.

Danny Welbeck will likely feature (Reuters)

He was one of Javi Gracia's final signings at Vicarage Road before he was sacked last weekend following a poor run of form and replaced by Quique Sanchez Flores.

Emery added: "Danny's an amazing person and a very good player. He had that injury and he finished here and now he is at Watford and I wish him the best."

Welbeck was one of 10 first-teamers to leave Arsenal permanently this summer, although defender Shkodran Mustafi did not depart.

He was expected to leave before the European transfer window shut on September 2, but decided to stay with the Gunners and Emery insists he is now firmly part of his plans moving forward.

Shkodran Mustafi remains at Arsenal (Getty)

"Some players left and we didn't decide that option at the beginning. When they left it was because we decided we can continue in our way with different options. Mustafi decided to be here and when he decided to be here he's like another player," Emery said.

"I respect his decision. When he decided I spoke to him and said 'you're one more in the squad, I'm going to work with you as other players'.