West Ham, Swansea, Hull City and Sheffield Wednesday are also keen on the Scotland international, according to reports.
The cluster of sides chasing Blackburn striker Jordan Rhodes have received a major boost in their pursuit of the Scotland international, after The Scottish Sun reported that Rovers were set to sign Tony Watt on loan from Charlton Athletic.
The former Celtic man had been on loan at the Addicks' Championship rivals Cardiff City until earlier this month, and had been expected to make a £2m permanent switch to the Bluebirds (via The Scottish Sun).
However, The Scottish Sun reports that Cardiff's transfer embargo left them unable to make the move, which has allowed Paul Lambert's side to swoop in, and perhaps leave the door open for Rhodes to leave Ewood Park.
Lambert has previously suggested that the 25-year-old could be sold if the money was right, due to Blackburn's financial worries (via The Scottish Sun), and Watt's arrival may now alert those chasing Rhodes' signature that Blackburn would be more willing to let him move on.
Middlesbrough appear to be the side leading the chase, with The Scottish Sun suggesting that they are willing to pay £11m for the forward, while Hull City, Sheffield Wednesday, Swansea and West Ham are also interested.
While Rhodes is undoubtedly one of the most ruthless goalscorers in the division when he is on form, he has recently gone through a dry spell that lasted nine games before he scored against both Newport and Charlton.
And with Rovers only six points above the relegation zone, Lambert may have decided that he would rather replace Rhodes with Watt, while also spending whatever money they receive for the former Huddersfield man to strengthen other more pressing concerns.