Keller is one of five Americans currently struggling to keep Roy Hodgson's team afloat in the Premier League.
He said: "Like it or not, every top club is now a franchise.
"I understand the fans' frustration with the boardroom situation at Liverpool. It's never going to be nice when you have two very wealthy businessmen fighting for control.
"But the nationality of those two guys should have nothing to do with it. They could just as easily be British.
"The fact they're both American is just something the supporters have latched on to."