West Brom boss Tony Pulis has angered Stoke manager Mark Hughes by calling his captain Ryan Shawcross a "loser".
Hughes claims Shawcross received the voicemail from Pulis on Monday, two days after Stoke's defeat at West Brom.
Shawcross, Stoke skipper for several years under Pulis, accused the Baggies of leaking the news of former Albion striker Saido Berahino's two-month ban.
Berahino made his Stoke debut in the game and Hughes said: "We were annoyed with a number things."
There was no handshake between the managers at the end of the game and Hughes added: "Any number of things surrounding the game were, in our view, unnecessary.