Manchester United attacker Juan Mata is excited at the prospect of facing his former club.
United have a poor record against the Blues, especially at Stamford Bridge.
They have not won there since 2012, but Mata is still thrilled at taking on the team where he won a UEFA Champions League title.
"It's always a special game for me against Chelsea and it will be tough - they are doing good," Mata said on MUTV.
"They have a new manager and they play with more or less the same players but in a certain style.
"I know many players and people from the backroom staff there," he added. "Cesar Azpilicueta is a very good friend from the time I was playing there.
"David Luiz is still there, Willian's still there. Eden Hazard, who is a good friend, and Gary Cahill... so there are still some players there I know."