0600 GMT January 26, 2020
The Blues suffered its fifth defeat of the season in all competitions after Maicon’s second-half header gave the home side a 2-1 victory, BBC wrote.
“We watch dozens and dozens of repetitions of Porto taking corners. We were completely ready for that,” said Mourinho.
The Blues has now lost more games this season than the whole of 2014-15.
It endured just four losses in the last campaign, but has been beaten five times in 11 games this term.
Despite winning its opening Group F game 4-0 against Maccabi, the London side was beaten in Portugal by Andre Andre’s strike and Maicon’s header, in between Willian’s brilliant free-kick.
Chelsea is third in Group G, a point behind Porto and Dynamo Kiev.
It is also struggling in the Premier League, lying in 15th place, eight points behind leader Manchester United.
Mourinho, who described his side’s first-half display against Newcastle at the weekend as “minus one out of 10”, was pleased he “got a performance” against Porto, which he managed from 2002-04.
“When the game is under control we concede a goal that is ridiculous,” said Mourinho.
“It hit the post from a similar mistake. Apart from that the game was balanced. Two ridiculous moments and we were punished.
“The team played well and there were good reactions from the goals we conceded. We had chances to equalize and had desire. When you feel everything is going against you it is disappointing. The team tried until the end so I have nothing to say against them.”