Arsene Wenger has confirmed that Tomas Rosicky picked up a new injury in Arsenal's FA Cup win against Burnley on Saturday, his first appearance of the season.
Rosicky came on for about 20 minutes in the second half in his return from a serious knee injury that he suffered last June - only to pick up a thigh problem right away. Wenger said the injury was still being assessed, but would not give a timeline for the Czech Republic midfielder's latest recovery process.
"He'll have a scan today, and we'll know much more about it tonight, I think," Wenger said at his news conference ahead of Tuesday's Premier League game against Southampton.
The Arsenal manager also denied reports that Jack Wilshere had suffered a setback in training, as he continues his recovery from a broken leg.
Wilshere has not played all season, but Wenger said the midfielder is still on course for a comeback in March and should still be able to compete for a spot in England's squad for Euro 2016.
"He's looking good I must say," Wenger said. "Overall I had a short chat with Roy Hodgson about him [on Saturday] and reassured him that he is progressing well."
Wenger predicted a quiet transfer deadline day for Arsenal, but said a loan deal for Mathieu Debuchy could still happen.
"At the moment, it doesn't look like it. But it's still a possibility," he added.
The France right-back wants more playing time ahead of the Euros, and if a deal happens it's likely to be a loan to another Premier League club, while winger Serge Gnabry is likely to go out on loan to Championship club after being recalled from his unsuccessful spell at West Bromwich Albion.