A season to forget in Oakland may have taken an unusual turn as two A's players engaged in an altercation that left one injured, according to a San Francisco Chronicle report.

A's players Billy Butler and Danny Valencia were involved in some sort of clubhouse spat Friday, according to the report. Since then, Butler has missed Oakland's games Saturday and Sunday with what manager Bob Melvin said was nausea and vomiting.

Valencia, who did not play in Sunday's game, issued a "no comment" about the alleged incident after the Athletics' 4-2 loss to the White Sox, but added, "What happens in the clubhouse stays in the clubhouse."