Chelsea stars Diego Costa and Oscar were reportedly involved in an altercation at the club's training ground at Cobham, as club staff had to separate the pair after two rash tackles.
The Daily Mirror's Darren Lewis claims the Brazil international didn't hold back on a challenge on Costa, described as “a particularly hefty tackle,” and the Spaniard replied in kind, resulting in a bust-up.
The two had to be separated but reportedly calmed down before heading for the dressing room together.
Costa and Oscar have been among the Blues' most disappointing players so far, although they have looked much improved since the appointment of interim manager Guus Hiddink.