"I made the decision to do that. Peter is a terrific coach and has incredible sideline instincts, probably one of the best I've ever seen. But over a period of time we determined that we were no longer on the same page between ownership and Peter's philosophy managing the team," said CEO Nick Sakiewicz during the press conference.
The Union are currently ninth out of 10 teams in the Eastern Conference, having managed just two wins during their first 11 games this season. Philadelphia has eight points for the season, better only than Toronto FC in the MLS standings.
It was just a friendly, but the Union lost to their USL affiliate, the Harrisburg City Islanders, 3-2 on Tuesday night.
For more on the Union, visit the SB Nation blog Brotherly Game.