AFPSanchez will miss Barca's league match at Getafe on Saturday, when they will seek a fourth win in four games this season, the club said in a statement on their website.
The speed of his recovery will determine whether he will be available for Wednesday's Champions League Group G match at home to Spartak Moscow, the statement added.
Iniesta picked up a leg muscle strain playing in a World Cup qualifier for Spain against Georgia on Tuesday and is out for 10-15 days, Barca said on Wednesday.
