Tykes manager Mark Robins' former club Manchester United travel to Oakwell on Tuesday for a third-round Carling Cup clash, but Foster claimed Barnsley's bid for a fourth win in five league matches is uppermost in the players' minds.
Foster told the club's official website: "We just want three points on Saturday and that's all anyone here is bothered about.
"You will not find anyone looking past this weekend's game with Bristol City and getting a win here at Oakwell is all that matters.
"Bristol are a good footballing side with pace and we will have to be on our toes. We are a very confident squad at the moment."