Tomas Rosicky's latest injury has left the veteran midfielder "devastated" and Arsenal's medical staff dumbfounded, Arsene Wenger has revealed.
Rosicky made his first appearance of the season for the Gunners on Saturday after recovering from a serious knee injury -- only to pick up a thigh problem within minutes of coming on in the 2-1 over Burnley in the FA Cup.
Wenger said "nobody understands" how Rosicky was injured again so quickly, and was adamant that the Czech Republic international had gone through his warmups properly.
"He warmed up well, he warmed up for 20 minutes," Wenger told newspaper reporters. "I told him straight away after halftime, warm up. I observed him, and he's very conscientious, Tomas. He did sprint and sprint and sprint."
Wenger said he could tell that something was wrong from the way Rosicky was running on the pitch, but the player only told him after the game that he had a problem.
"He told me that after three minutes he got the injury," Wenger said. "I looked at him [during the game] and thought, 'Tomas you do not run properly,' because he did not lift his legs.
"And he lost some balls that I was amazed from him, because he's top level technically. But when he told me after the game that he did it [get injured] straight away I understood why, what happened to him.
"He stayed on, he said 'I stayed on because you could not change any more.'"
Rosicky was undergoing a scan on Monday to determine the extent of the problem, and Wenger said he was still hoping for good news.
But the injury is the latest blow for Rosicky, who previously missed the entire 2008-09 season and the first half of the 2012-13 campaign. He is now in the last year of his contract with Arsenal and faces a battle to be fit enough to captain the Czech Republic at the European Championship.
"He is devastated. It's unbelievable," Wenger said. "Such a good player, but his career has been so disrupted by so many injuries. And now, he was born in 1980, he's going to be 36. It's difficult for him."