By Arsenal correspondent Tony Hughes

Tomas Rosicky suffered a shattering injury blow in his first Arsenal match of the season, Football Insider sources understand.

The veteran midfielder damaged a thigh muscle in his comeback and is facing another lengthy spell on the sidelines.

An Arsenal source has told Football Insider that Rosicky will undergo medical tests on Sunday to determine the extent of the injury.

The fear of Gunners medics is that the Czech international could be out for two months in yet another blow to manager Arsene Wenger.

Rosicky made his first appearance of the season, and his first since last May, as a 71st minute substitute in Saturday’s 2-1 FA Cup win over Burnley.

There will now be fears that the 35-year-old, who is out of contract in the summer, has played his last match for the club he joined from Borussia Dortmund in the summer of 2006.

It is yet another injury blow for Arsene Wenger whose season has been disrupted by losing key players, particularly in midfield.

Francis Coquelin made his return on Saturday after two-and-a-a-half months out but Jack Wilshere and Santi Cazorla are still sidelined.