"We have a little concern about Walcott's hamstring but it should be all right," Wenger told Arsenal TV online.
Centre back Johan Djourou is sidelined for the trip to east London after suffering a back problem at the Emirates.
"Djourou has a back problem. He is the one who certainly will not play on Sunday," said Wenger.
"All the others are smaller things I will assess slowly.
"Sagna is back from suspension but Abou Diaby is still suspended. Marouane Chamakh will be back in the group.
"There will be some rotation. We will see what I do. We play Sunday, Wednesday and then Sunday again.
"But I have shown in many competitions that I have the same belief in every player."