"David has tried to lift me and told me that I am going to make it," he told the Bild newspaper. "I know that he hopes that everything works out for me at Bayern. We are in contact and write each other text messages.
"I told him recently that I think it's great how he is playing for AC Milan."
Both players are due to return to the States in time for the start of the new MLS season, but Donovan is not yet convinced his future lies back in his homeland.
"That would not please Galaxy," he said. "David has already said he will be back in Los Angeles in mid-March, but the situation is a bit different with me.
"I want to make it here."