Manchester United are considering possible alternatives to Everton's Leighton Baines as Portuguese reports suggests Porto left back Alex Sandro is being monitored by the club.
Everton were resilient in their attempts to retain the services of their left back during the summer, rejecting two bids from United before David Moyes eventually admitted defeat.
The England international has not played since the his side's 3-3 draw with Liverpool last month and could possibly find his route back into the first team blocked by Bryan Oviedo, who has shone in the defender's absence.
Moyes may have also turned his attention away from his former player as Portuguese publication A Bola suggest the Scot has now identified Porto full back Sandro as a long term replacement for Patrice Evra.
While United's regular stand in captain remains a fan favourite at Old Trafford he is approaching the end of his current contract with no sign of fresh talks on the horizon.
The Manchester United boss was pictured watching on from the stands during Atletico Madrid's 2-0 win over Porto in the Champions League last week, reportedly casting an eye over the Spanish side's 22-year-old midfielder Koke.
But A Bola suggest the former Everton manager was also keeping a close eye on 22-year-old Sandro, as he considers making the Brazil international Evra's replacement on the left hand side of his defence.
In addition to the Frenchman's uncertain future at Old Trafford, the lack of dependable cover in that position may be a concern for Moyes. The manager has opted to deploy Alexander Buttner at left back when resting Evra, but the Dutchman's performances have failed to impress, suggesting a more long term solution is required.
Fabio da Silva remains an option within the ranks, but Moyes' reluctance to play the Brazilian despite his impressive loan spell at Queens Park Rangers last season suggests his days at Old Trafford may be numbered.