Queens Park Rangers
The Rs say they want to keep the striker but his buyout clause is reportedly set at £10million, with Liverpool the latest club to have apparently shown concrete interest.
The south London club reportedly offered the 22-year-old a superior financial deal.
Elswhere, QPR's stadium plans also took a hit after a former sponsor criticised their proposals to move to a new venue.
The 29-year-old will link up with assistant manager Roy Keane, who he previously worked with at Manchester United and Sunderland.
Richardson made 48 appearances for the west London side, scoring six goals in that time.
The striker is just 16 years of age but is highly rated by those at Craven Cottage.
Meanwhile, another striker signing, Ross McCormack, has given his first interview with the club.
“Having spoken to the Manager, very quickly, I realised that this was the club for me,” he told Fulham's official website. “The transfer took a little longer than I initially anticipated, but I’m just happy to be here now.
“I’ve been with the boys for a few days, and I have to say that I’m really impressed by what I have seen. I just want to add to the squad and play my part in what I hope will be a successful season ahead."