By Declan Taylor

Arsène Wenger is certain that Theo Walcott will have an impact on Arsenal's run-in this season.

After almost four months out with a shoulder injury, the England ace returned to the first-team squad for last Sunday's FA Cup victory over Burnley and was unlucky not to score during his brief substitute appearance.

Three days later, Walcott came off the bench in the Gunners' Champions League clash with Roma and duly slotted home his penalty in the shoot-out.

Unsurprisingly Wenger is delighted to have the 19-year-old back on board.

"I think Theo is quite fit and he has worked hard," said the manager at Friday's pre-match press conference.

"But it takes some time to come back from shoulder injuries and get your balance back in the way you run, the way you protect the ball and when you change direction.

"He is ready and can contribute highly until the end of the season."

Copyright 2014 The Arsenal Football Club plc. Permission to use quotations from this article is granted subject to appropriate credit being given to www.arsenal.com as the source 13 Mar 2009