Fulham's move for Watford striker Marlon King has unveiled the extent of his nagging knee injury.

King has been told he may have to quit the game in three years due to the condition of his knee, says thisishertfordshire.co.uk.

The 27-year-old underwent a stringent two-day medical at Craven Cottage at the weekend after Watford accepted a £5m cash offer for the 11-goal striker.

Tests and scans revealed King has a deteriorating problem in his right knee and it understood that the problem is inoperable.