Jaap Stam has warned Manchester United and Liverpool that transfer target Jurrien Timber 'lacks the aggression' needed in the Premier League.
The Dutch defender was previously linked with a move to the Red Devils upon the appointment of his former manager Erik ten Hag at Old Trafford.
But after a string of discussions during last summer's transfer window, talks between the two parties fell through and Timber made the decision to stay at his boyhood club.
Liverpool are also said to be keen on the 21-year-old, but former centre-back Stam worries Timber will struggle against Harry Kane and Erling Haaland.