The Premier League representatives recorded a 1-0 victory over the Catalans at Stamford Bridge, and Van der Sar has stated that Barca should beat Chelsea in the return 'for the sake of football'.
"For the sake of the game and for football in general, I hope Barcelona win at Camp Nou," Van der Sar was quoted as saying by the Daily Mail.
"I love teams who attack. Chelsea did nothing but defend with nine players and kept lots of players in the middle of the park.
"But this tie could have been over by now. I expected Chelsea to lose by a big figure. And it could still have been 5-1 to Barca in the end. Chelsea had just one shot at goal – and they scored."
Tuesday's second leg kicks off at 20.45CET.
