According to 'Sky Sports', 'Rovers' made an offer for the forward on Wednesday.
Freeman, 26, has also been linked with moves to Middlesbrough and Sheffield United this summer.
The Englishman joined QPR in January 2017 after a move from Bristol City, and has since scored 7 goals in 61 appearances for the Championship side.
QPR were defeated 1-0 on Saturday by Preston North End in their Championship opener.