Foster believes the club should stick to the quality-rather-than-quantity approach.
He told the WBA website: "I'm curious about the summer - and it's the same for the fans as well."
Foster then quipped: "The fans probably think we can bring ten or 12 different players in with the new TV deal!
"There's going to be a lot more money being pumped into the Premier League next season but you don't want to go crazy.
"You don't want to add too many players because you might upset the good balance that we've got going at the minute.
"I'm sure the gaffer will be sensible and maybe add three, four or five faces."