A John Terry own goal helped the Eagles earn a 1-0 victory over Jose Mourinho's men.
He told the club's official website: "In respect of who it's against, it's a big win, but it means nothing if we go to Cardiff next week and get beat.
"We can't get carried away. We know we've got seven games to go and we've got to make sure we put in the same level of performance for the rest of the season and pick up enough points to stay in the Premier League."
Pulis's men travel to South Wales next weekend to take on Cardiff City.