Willian and Ramires saw red in the 1-0 defeat to Aston Villa, taking the match official's tally to six sendings off in the last eight games involving the Blues
Willian was shown a second yellow card for a challenge on Fabian Delph, while Ramires received a straight red for his tackle on Karim El Ahmadi in a 1-0 loss at Villa Park which damaged the Blues' title charge.
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"The players were speaking about it [Foy's record] during the week," Mourinho told reporters. "My philosophy is that I never care who the ref is, I don't want to know.
"I always think that the referee is a good referee but during the week the players were speaking about the situation and I think from now on, the next time we have Mr Foy, I have to work my people in a different way."
Mourinho also said it would be "helpful" if the Professional Game Match Officials Limited [PGMOL] investigated Foy's performances in Chelsea matches.
He added: "Maybe it is helpful that the committee doesn't send him to our matches. I don't have the right to request [that].
"I think they have to analyse the situation and see if every time he has Chelsea – or not every time – but many times he has Chelsea and problems are there, I think maybe it would be a good decision."