The Sweden worldwide has been heavily linked with a move to Old Trafford and came close to a transfer in the January transfer window.
United have now confirmed a deal with Benifca to sign Lindelof, though personal terms are yet to be finalised.
Lindelof will now have to undergo his medicals with the club and then United will be able to officially confirm the deal.
It is thought that he and Eric Bailly could form a formidable partnership at the heart of Mourinho's United defence.
ESPN's Manchester United correspondent Rob Dawson tells us who he thinks Jose Mourinho will recruit this summer.
Now the Portuguese football grapevine is buzzing once more with suggestions that Lindelof will travel to Manchester once his worldwide commitments with Sweden have ended to finalise a move to United.
The Benfica defender has established himself as one of the most promising defenders in the Portuguese top-flight over the last two seasons as he has helped his side win two Primeira Liga titles.
Jose Mourinho is reportedly a long-term admirer of the Swedish worldwide, who played all 90 minutes in Friday's surprise 2-1 win over France in 2018 World Cup qualification.
Are Manchester United fans excited by the prospect of Lindelof?