Manchester United have made contact with Royal Antwerp over a deal for goalkeeper Senne Lammens, sources have told ESPN.

United are not looking to replace current No.1 André Onana , according to sources, but are interested in boosting their group of goalkeepers with the former Belgium under-21 international.

Antwerp value Lammens at around €20 million ($23.4m).

Should the 23-year-old arrive at Old Trafford, sources have told ESPN it would raise questions about the future of Altay Bayindir .

Bayindir, Onana's understudy, was at fault for Arsenal 's winner in United's 1-0 defeat to Mikel Arteta's side on the opening weekend of the Premier League season.

Onana, who missed United's preseason schedule with a hamstring injury, is fit to make his return against Fulham at Craven Co

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