Roy Keane labelled want-away Chelsea striker Diego Costa "a balloon" but hailed Tottenham star Harry Kane's potential to match Cristiano Ronaldo after an exceptional Champions League performance.
Costa is yet to feature for Chelsea this season as he continues to push for a move back to Atletico Madrid following the breakdown of his relationship with manager Antonio Conte.
Speaking on ITV, Keane said: "I know he did well for them, but to me he's big trouble. He looks a bit of a balloon."
England striker Kane scored a superb solo goal to put his side back in front, after Andriy Yarmolenko cancelled out Son Heung-min's opener.
He then sealed the win as he found the far corner on the hour mark to make it four goals in his last two games following a barren August, having also scored twice in England's 4-0 World Cup qualifying win over Malta this month.
"If he keeps improving the way he is doing, he will be up there with the Ronaldo's in another few years," the Irishman added.
"Kane is outstanding. His overall play, hold-up play and his movement, this kid is the real deal.
"He needs to be in the latter stages of the Champions League for that to happen, but the rate he is going at, barring injury, he will be up there with the best."
