Manchester United are keeping tabs on Porto defender Alex Sandro, according to reports in Portugal.
Portuguese newspaper Record claims United and Inter Milan are tracking the 22-year-old Brazilian international - but Porto are reluctant to sell and Sandro is happy at the club.
The former-Santos star has made six appearances for the Brazil national side, and is hopeful of a spot in Luiz Felipe Scolari's World Cup squad.
But he hasn't appeared for his country since September 2012, with Marcelo and Maxwell the two first-choice left-backs.
United have been linked with several full-backs as they plan for life after Patrice Evra.
The 32-year-old French international has been a consistent performer for Moyes this season, but the likes of Luke Shaw, Leighton Baines, Fabio Coentrao and Sandro have all reportedly been under consideration at various points this season.
Sandro has been an ever present for the Portuguese giants this term, making ten appearances in the league and five in the Champions League.
And he's also the club's best player in Europe this campaign so far, according to statistics site whoscored.com, averaging a 7.83 rating per game - above the likes of Eliaquim Mangala and Jackson Martinez.
Both Porto stars are also thought to be Premier League transfer targets in the upcoming winter window.