Manchester United have shown an interest in re-signing Michael Keane two years after selling the central defender to Burnley for £2.5million.
Everton are leading the pursuit for Keane with Liverpool and Chelsea also monitoring the situation but United have now placed their former academy graduate on a list of summer targets.
Jose Mourinho has suffered the double blow of losing Chris Smalling and Phil Jones to 'long-term' injuries and wants to bolster his defence in any case.
Keane has emerged as a genuine possibility after accomplished displays for England, showing adaptability that would appeal to the United manager.