Derlei's goal continued Porto's record in the Champions League this season of having scored in every away match, while it was the first Deportivo had conceded at home.
"I think we could have won if it hadn't been for the penalty," Irureta said.
Porto's goal meant Deportivo needed two goals in the last half hour to advance, and Irureta responded by bringing on Spain striker Diego Tristan to bolster his team's underachieving attack.
Five minutes later, Uruguay striker Walter Pandiani glanced a header just wide but Naybet compounded his teams' woes by receiving a second yellow card for a wild tackle on Derlei.
Tristan sent a free kick just wide in the 77th minute but, despite its urgency, Deportivo largely failed to trouble Porto's efficient rearguard and succumbed tamely.
Mourinho, who has been widely tipped to be the replacement for Chelsea coach Claudio Ranieri, said after the game he would be attending the other semifinal and his presence at Stamford Bridge on Wednesday will fuel speculation that he is to leave Porto in the summer.
ENGLISH LEAGUE
Arsenal rallied from a goal down to extend its unbeaten league streak to 36 matches Tuesday with a 1-1 draw at Portsmouth.
Arsenal won the title two weeks ago without loss and is now attempting to finish the 38-match Premier League season the same way -- a feat no team has ever accomplished.
Arsenal has now won 24 and drawn 12 of its 36 matches and Arsenal manager Arsene Wenger admitted he was getting nervous. Matches against London rival Fulham and relegated Leicester remain.
"I must say we have had a tough time but the players were not ready to lose tonight," Wenger said. "We want to keep it going and you saw a really determined Arsenal tonight.
"Anything can happen in the game. We have come a long way though and Fulham will be another difficult game."
Lowly Portsmouth looked like ending the streak in the 30th minute when Aiyegbeni Yakubu chipped over advancing Arsenal goalkeeper Jens Lehmann.
Jose Antonio Reyes, who only joined Arsenal in January, equalized in the 50th minute, scoring from a Thierry Henry corner. The Spaniard also hit the bar and sent the ball inches over in a first half that Portsmouth dominated.
Wenger had rested striker Dennis Bergkamp and midfielders Gilberto Silva and Robert Pires for the match.
In the first division both clubs promoted to next season's Premier League -- Norwich and West Bromwich Albion -- lost. West Brom's 4-1 defeat to Stoke handed Norwich the division one title. Norwich lost 1-0 at Sunderland.
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