He's already been mentioned, but John O'Shea did just that, and ultimately, because his debut was so great, the rest of his career felt like a letdown relative to it as he looked like he was going to be an outstanding, two-footed, marauding full-back.Rooney is such a great example. Did it with Everton with the wonder goal and then came here and hit a CL hattrick.
Hard to burst onto the scene as a non goal scoring player, people probably don't remember if a young CB had a good game as opposed to a striker.
Tunazebe's peformance vs PSG, could've been the beginning of something special... unfortunately, he's a product born in the wrong era as he looks like he'd be a monstrous man-marking specialist.