The forward was left on the bench for the 0-0 draw at Tottenham.
He also appeared to throw a training bib at Mourinho during the match.
The Stamford Bridge boss says there's no problem with Costa – and he'll be treated the same as anyone in his squad.
Elsewhere, Richie Towell has completed his move to Brighton from Dundalk and one former Ireland international thinks he could still make Irelands squad for Euro 2016.
The former Dundalk attacker has joined on a 2 and half year deal but won't be allowed play until January.
