Neil Warnock has yet to sign a new striker since Barry Hayles left for Millwall on the day United beat QPR 1-0 at Loftus Road.
Jansen has yet to start a game this season, nor has he been included as a substitute which suggests he is not part of Graham Souness plans at Ewood Park.
Also, Rovers have just secured the signature of former Coventry striker Jay Bothroyd from Italian side Perugia which means a move for Jansen is more than likely on the cards.
However, Jansen's name is just one of 20 strikers who's name has been circulated to Blades-mad, so watch this space!!!