Tomas Rosicky is set to miss at least four weeks with a thigh injury sustained on his long-awaited comeback on Saturday.

The midfielder made his first appearance of the season in the 2-1 win over Burnley, as the Gunners booked their place in the FA Cup's last 16, coming on as a 71st minute substitute.

But the Czech Republic star suffered a muscular injury to his upper leg in his brief cameo and is facing another spell on the sidelines.

Tomas Rosicky is set to miss at least four weeks with a thigh injury sustained on his long-awaited comeback

The midfielder made his first appearance of the season in the 2-1 FA Cup fourth round win over Burnley

Rosicky underwent a series of tests to establish the extent of the injury, with manager Arsene Wenger due to provide an update on the midfielder's injury on Monday.

However, Arsenal fear he will miss at least a month with the latest injury.

The news comes as a huge blow to Rosicky who has had a long route back to fitness following his spell on the sidelines.

Rosicky, 35, is set to leave the Emirates Stadium this summer when his contract expires.

Wenger on Friday revealed how Jack Wilshere's return from an ankle injury has also been delayed.

The England star was due back this month, but he is now not expected to return until mid-March.

Meanwhile, Wenger says the FA will regret allowing talented rookie Alex Iwobi slip through the net.

The 19-year-old impressed during the win over the Clarets and received high praise from his manager after the match.

Indeed, Wenger has refused numerous attempts from Championship clubs to loan Iwobi in recent months as he believes the youngster can play a role this season.

The Czech Republic star was in cheerful mood ahead of kick-off as he prepared for his first game of season

Rosicky shared a joke with Theo Walcott ahead of kick-off as Arsenal reached the fifth round of the FA Cup

HISTORY OF TOMAS ROSICKY INJURIES AT ARSENAL Knee - June 12, 2015 Hip/Thigh - December 3, 2014 Calf/Shin - October 11, 2014 Hip/Thigh - April 7, 2014 Ankle/Foot - March 16, 2014 Groin/Pelvis - March 11, 2014 Broken Nose - January 13, 2014 Calf/Shin - December 29, 2013 Calf/Shin - October 6, 2013 Hamstring - September 10, 2013 Ankle/Foot - August 17, 2013 Knock - August 8, 2013 Hamstring - April 6, 2013 Calf/Shin - January 11, 2013 Calf/Shin - June 12, 2012 Hip/Thigh - May 19, 2012 Groin Strain - March 3, 2012 Back - February 26, 2012 Hip/Thigh - November 22, 2011 Knee - September 9, 2011 Groin Strain - August 16, 2011 Ankle/Foot - September 24, 2010 Ankle/Foot - May 1, 2010 Groin/Pelvis - March 12, 2010 Groin Strain - December 5, 2009 Knee - October 17, 2009 Hamstring - August 1, 2009 Hamstring - February 1, 2008 Groin Strain - November 7, 2007 Hamstring - September 20, 2007 Hamstring - July 30, 2007 Hamstring - April 30, 2007 Groin Strain - March 1, 2007 Hamstring - November 10, 2007 Groin Strain - August 18, 2007 Thigh Muscle Strain - May 31, 2006 Advertisement

Iwobi was born in Nigeria but has represented England at junior level.

However, the teenager, who is former Bolton star Jay-Jay Okocha's nephew, has since pledged his international future to Nigeria.

Iwobi has played two friendlies for the Super Eagles; but he is still eligible to play for England until he plays a competitive match for Nigeria.

Sources close to Iwobi have indicated the FA are keeping tabs on Iwobi's progress until he is no longer eligible for England.

However, the youngster is said to be staunch in his wish to represent his country of birth.

West Ham winger Victor Moses followed a similar path, representing England at junior level before switching to Nigeria.

And Wenger fears England could rue missing out on the versatile forward, saying: 'He plays for Nigeria now; he should play for England.

Gunners forward Alex Iwobi has been recommended as a future England player by manager Arsene Wenger

'I remember I turned him down for an Under-23 friendly tournament; then they called him up for the first team to force him to go.

'It's a massive football country. 180 million people, a big history. Okocha, his uncle, is a top legend there - (Nwankwo) Kanu, too.

'I think he has shown everybody that he is a good football player. I find him, personally, very interesting. His decision-making is spot on. 'His awareness is very interesting. He's a boy who two years ago not many would have said: 'he will be a good player'.

'He developed very well. He's very clever. I like his game. I like the timing of decisions, and the quality of his decision-making.

'He always turns where you want him to turn, and he plays the ball where you want him to play the ball. He's very interesting.

'I have a hesitation about loaning him because I think this guy could very quickly play. He's one who when he was a kid, you could pass by if you don't watch well in training.