Arsenal forward Alexis Sanchez will miss the start of the season after helping Chile to win the Copa America.
Sanchez, 26, scored 25 goals for the Gunners last season as Wenger's side finished third and added a stunning goal as they won the FA Cup.
Gunners boss Arsene Wenger said: "Alexis will be back with us on 3 August and usually it takes three weeks to be competitive.
"With Alexis it could be a bit less. He will miss certainly the first game."
Sanchez will miss the Community Shield against Chelsea on 2 August.
The Gunners then open their Premier League campaign against West Ham on Sunday, 9 August, and if Sanchez did need a full three weeks to be match fit he could also miss games against Crystal Palace and Liverpool.
Sanchez scored the winning penalty as hosts Chile won their first Copa title against Argentina on 4 July - the end of a 58-game season for the former Barcelona forward.
Manchester City defenders Pablo Zabaleta and Martin Demichelis and Manchester United pair Angel Di Maria and Marcos Rojo all played for Argentina in that final.

SOURCE: BBC.CO.UK / links