Jon Walters put the Potters into the lead but they were pegged back by Didier Drogba.
"It was a great start and Jon scored a great goal but we sat back and gave them the impetus and in the last 20 minutes of the first half they showed what a great team they are," said Pulis.
"We had too many players after we scored sitting back and watching them pass it around.
"In the second half we pushed on to them with better quality balls up to Kenwyne Jones and got more bodies up there and it made for an entertaining game. We had the chances to win it but Chelsea are a great side with great players and you have to give them credit.
"They have a massive Champions League game against Manchester United on Wednesday and I thought their attitude was first class. You have to give them and their manager full credit because that was a tough game for us."