Brendan Galloway’s rapid rise into the Everton first team is to be rewarded with a new contract and improved terms.

With the England left-back Leighton Baines injured, the 19-year-old has impressed filling in this season and Roberto Martínez believes it is time to formally recognise Galloway’s progress. He signed a five-year deal when he moved from MK Dons in August 2014.

“What is true as well is that he’s had a quicker development than we expected – and that is down to his own personality and character,” Martínez said. “Nothing fazes him, he’s always ready to improve, always ready to perform and, at the football club, we will always do the same thing; when we see a player get ahead of his programme, that needs to be rewarded. That’s not going to be the last contract, it’s just going to be the next step, and we expect Brendan to carry on with his development over the course of the season and in years to come.”

Martínez is still waiting to hear injury updates on Muhamed Besic and Seamus Coleman after both were forced off in the win over Chelsea.

“I think Seamus felt a lot better than Mo but we’re going to get the scans done today so we have a clear idea,” he said.

“I don’t think it looks as bad as we feared once it happened but we’ll get more information as the week goes on and we’ll see how long a period we’re looking at for the two players. They were the only two to pick up knocks against Chelsea, so everyone else from that squad is fully fit for the weekend.”

Martínez was also boosted by summer signing Leandro Rodríguez – the 22-year-old brought in from River Plate Uruguay for £500,000 – who scored a second goal in as many matches for the under-21 side. Leon Osman and Darron Gibson also made their comebacks from injury in the 1-1 draw at home to Sunderland on Monday, as did the goalkeeper Joel Robles.