Championship clubs are unimpressed by the sale-and-return deal for defender Hassane Kamara between Watford and its Italian sister club, Udinese, because they fear it will give the Hornets an unfair advantage in the promotion race.
Watford have sold the left back to their Italian counterparts for £16M, a mark up of more than £12M on what the Hornets paid for the player as recently as January.
The deal between the two clubs, which are both owned by the Pozzo family, gives Watford a valuable cash boost as they seek to stabilise their finances following relegation from the Premier League and as they bid to make a rapid return to the top flight.