Richards has been one of the Angels’ best pitchers this season, going 13-4 with 164 strikeouts.
"I had a chance to talk to him," Angels pitcher Jered Weaver said on Wednesday. "He just wanted to know what the story was. He wasn’t feeling too much pain when he was on the table. When the doctor came in and told him that he might have done something to his patellar tendon and there might be surgery involved, he kind of lost it."
Richards’ injury leaves gaping hole in Angels’ rotation.