Arsenal have suffered another injury blow ahead of their second Premier League match of the season away at Crystal Palace.
Midfielder Tomas Rosicky will be ruled out for at least a month after undergoing arthroscopic surgery on his knee.
Last week, manager Arsene Wenger told reporters that the Czech international was on a "progressive recovery" but agent Pavel Paska revealed on Wednesday that the 34-year-old will miss the first part of the campaign.
"[Tomas Rosicky] underwent an arthroscopic surgery on his knee on August 4," Paska is quoted as saying by Sky Sports.
"The recovery is expected to take four to eight weeks."
The Czech joins Jack Wilshere on the sidelines who will be out for weeks after suffering a hairline fracture to his right ankle.