Sven Botman's lack of pace is a 'big question' which could be exposed in the Premier League amid Newcastle United's ongoing transfer interest.
That is the view of former England and Manchester United defender Rio Ferdinand, who fears the Lille centre-back could struggle with the speed of football in England.
The Magpies were unable to agree a deal with the Ligue 1 champions for Botman in the January transfer window, but retain an interest in the 22-year-old.