The Blues face the Portuguese side in their second Group G fixture on the back of their 2-2 draw with Newcastle.
And Mourinho is set to make big changes.
Mourinho refuses to speak about Costa [AMBIENT]
GETTY
Jose Mourinho at training ahead of the Porto clash
According to the Evening Standard Loic Remy, Eden Hazard, Cesc Fabregas, Branislav Ivanovic, Kurt Zouma and Nemanja Matic are all under threat.
Ramires, Willian, and Diego Costa will come in to the team, while John Terry, Ruben Loftus-Cheek, John Obi Mikel, Kenedy and Baba Rahman are under consideration.
"What has to change? The attitude of the players, because in the first half against Newcastle it was really poor," Mourinho said.
“Six of them were walking on the pitch, six of them were looking to the opponents moving the ball and just playing comfortably in their areas.
"When they got the ball it was slow thinking, slow decisions — that has to change. If it doesn’t change, we will lose in Porto, for sure, because they are a better team than Newcastle.”
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