Steve Kean feels Blackburn have acquired a gem in Jermaine Jones after the defender impressed on his debut in Sunday's 2-0 Barclays Premier League victory over West Brom.
The 29-year-old United States international arrived at Ewood Park this week in a loan deal from Schalke until the end of the season and was thrown straight into the action at left-back.
Rovers boss Kean said: "He's not even fully fit. He has not played for a number of weeks but he's got everything. I tried to say to him at the end, 'just save your legs a little bit', but he finds that difficult, he wants to tackle and join in."
He added: "His passing and the way he kept the ball for us as well was fantastic. He was a £10million player before his last injury and, with his performance today (Sunday) and another couple of games under his belt, I think he'll be fantastic for us."
Blackburn's new owners Venky's have stated their desire for a marquee signing before the January transfer window closes, but so far only Jones and fellow loan signing Roque Santa Cruz, who also played 90 minutes against the Baggies, have arrived at Ewood Park.
Ronaldinho and David Beckham are among the names to have been targeted by the club while they also failed with a bid for Birmingham winger Sebastian Larsson. Kean revealed on Friday he had turned his attentions to Argentinian playmaker Mauro Formica of Newell's Old Boys but he admitted that is far from a done deal.
He said: "That's gone a little bit quiet so I'm not really sure where we're at. That'll be picked up again and we'll see where we are with that."
West Brom had hoped to build on last week's win over Blackpool, which ended a run of six straight losses, but instead they shot themselves in the foot when Gabriel Tamas headed an own goal in the 41st minute, with Junior Hoilett adding a fine second less than two minutes after half-time.
The incident that really riled Baggies boss Roberto Di Matteo, however, was a foul by Jones on Peter Odemwingie in the 68th minute for which referee Mark Clattenburg awarded a free-kick despite the incident appearing to occur at least a yard inside the box.
He said: "I think, apart from the referee, everybody else thought we should have had a penalty. It's a foul and it's a penalty and I don't know how he saw it outside the box."
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