The Republic of Ireland international fell out of favour at the Tyneside club after the purchase of Senegalese pair Demba Ba and Papiss Cisse, and was not part of Alan Pardew’s plans going forward.
Steve Kean’s men are keen to bolster their contingent after relegation to The Championship, and Best joins Danny Murphy as another new face at Ewood Park.
Rovers have announced the deal on their official website, which will give the fans hope that their team can bounce straight back to the top flight.
“Blackburn Rovers have this evening completed the signing of Leon Best from Newcastle United,” a statement reads
“The 25-year-old striker makes the move from the North East to the North West for a fee of more than £3m, signing a four-year deal.”
Best scored 10 goals in 46 appearances for Newcastle.
By Gareth McKnight