According to the report, which cited unidentified sources, Mayo owed Allen money following the game and became increasingly angry toward Allen when asked to settle the debt. Several players eventually had to separate the teammates.
Grizzlies general manager Chris Wallace acknowledged the altercation in an e-mailed statement but provided no details about what caused the skirmish. He said: "The club considers the matter closed and will not comment further."
Allen had 19 points in the Grizzlies' 110-105 victory over Oklahoma City on Tuesday night. Mayo missed the game with bronchitis.