Manchester United legend Paul Scholes has said four players in the current squad could struggle to feature in Ruben Amorims new system.
Amorim will take charge of his last Sporting game this weekend before taking up his new role at Old Trafford.
The 39-year-old has been appointed as Erik ten Hags replacement.
Throughout his managerial career, Amorim has played a specific 3-4-3 formation, which has brought him success.
He is expected to implement a similar tactical style with United, but the uniqueness of the wing-back position has raised questions about who may feature in that role.
