The Galaxy take on Yallop's San Jose Earthquakes this weekend and Donovan is keen to go into battle against his former mentor who he admits gave him a good start in the professional football world.
"We're still friends," said Donovan, who also played for Yallop on the Galaxy from 2006-2007. "We chat once in a while. Frank really gave me a start as a professional, and I obviously owe a lot to him. It's going to be a lot of fun to see him."
Donovan went on to praise Yallop, saying he is a great person to play under and play for.
"Frank is pretty laid-back," Donovan added. "He's a players' coach, but he has his moments where if you're not doing what he asks of you then he'll let you know about it.
"For the most part, I think every guy in the league that's played for him would say that you always want to play for Frank. He's a good motivator and he makes sure you're ready to play every game."