By Richard Clarke
The Czech Republic midfielder played in the first leg of the Champions League qualifier at Dinamo Zagreb two weeks ago but has been sidelined ever since with a groin problem.
Freddie Ljungberg is omitted for the game at the City of Manchester Stadium but Jens Lehmann is back after missing the return rubber against Zagreb at Emirates Stadium this week with a knee problem. Thierry Henry was on the bench for that game but is expected to start this one.
"Rosicky is back in the squad," said Arsène Wenger. "But Ljungberg is rested. Lehmann is OK and Henry is back.
Jose Antonio Reyes has a groin problem and Justin Hoyte is set to continue at left back in the absence of Ashley Cole. The England defender has been omitted once more in the wake of his proposed move to Chelsea.
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