Porto star becoming more in demand in the Premier League.
Manchester United are set to rival Chelsea for the signature of highly-rated Porto defender Alex Sandro this summer, according to talkSPORT.
Read More Manchester United Transfer News
United had shown a tentative interest in the 23-year-old before the January transfer window opened, as David Moyes continues to search for a replacement for the veteran Patrice Evra.
The under fire Scot had viewed him as a cheaper alternative to Southampton starlet Luke Shaw, but his reluctance to make a bid in the new year has given Chelsea the impetus to declare their own interest and now Moyes faces a struggle to come out on top in the race for the player’s signature.
Mourinho has used right-back Cesar Azpilicueta out of position on the left-hand side for the majority of the season and wants a specialist left-back ahead of next season.
Sandro is believed to have a release clause installed in his contract for around £40m, but both Chelsea and United are hopeful of being able to convince the Portuguese giants to sell for considerably less at £15m.
The full-back joined Porto from Santos in 2011, and has won two league titles during his time in Portugal.
Check out the top 10 best Manchester United players of all time.
See who makes the top 10 best Manchester United signings.
Watch the top 10 best Manchester United goals.