Parker played for Mourinho during his first spell in charge of the Blues.
"It's a big game for us," Parker said. "It's always going to be a big game. We'll go there, set out and try and see what we can do. We'll work on it this week and try and pick up a result if we can.
"He [Mourinho] has added another dimension to Chelsea certainly. For us it's obviously another game against a very, very good team that we'll prepare well for and go and give them a game."