Skysports.com understands that Portsmouth have lodged a bid for Martin Paterson.
The Northern Ireland international has emerged as a Pompey target in recent weeks and now they have made their move.
It is believed that Portsmouth have made an offer in excess of £2million and Burnley are now considering their options.
The 24-year-old is believed to be part of Eddie Howe's plans at Turf Moor - but the offer may be too good to turn down.
Steve Cotterill will now be hoping to conclude a deal for the former Scunthorpe man.