Sunderland's Danny Graham praised by Blackburn boss
Graham, who signed on loan at Ewood Park for the rest of the season in January, headed home Rovers' third in their 3-0 win against Fulham, latching onto Elliott Bennett's cross.
And Lambert was delighted with the striker's performance as Rovers put an end to nine games without a win.
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Hide AdHe said: "Danny Graham has scored at every level and it's funny because even when I was with Norwich, he was scoring goals with Swansea in the Championship.
"I always liked the way he played the game and there's always a hunger with him.
"You see his workrate, everything he gave us.
"If there's one guy I'm absolutely delighted for to score a goal it's him because he's a top guy, top pro and honestly if we can keep him fit, he will be a very good signing for us."
Graham's header came after Ben Marshall had converted from the spot after 15 minutes and Shane Duffy's first Ewood Park strike just after the hour mark.
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Hide AdThe win also put an end to Rovers' winless home run stretching back to the first weekend in December.
Graham, who has only scored once in an unhappy three years at the Stadium of Light, will look to continue to fill the large gap left by star striker Jordan Rhodes, who made his full Middlesbrough debut against Leeds on Monday night after an initial £9million move to Teesside on deadline day.