Both sets of players clashed in the tunnel after Saturday's 2-2 draw, which saw Mourinho throw out the insult at Jonas Olsson.
An Albion source told the Mirror: "There was no need for Mourinho to say that. West Brom's players have lost a lot of respect for him. Mourinho has achieved so much as a manager, why did he have to act so low?
"West Brom know their players are not man for man in the same class as Chelsea. But they feel Mourinho overstepped the mark and should have shown more respect."
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