One of the fascinating battles within the Manchester United v Milan Champions League semi-final will undoubtedly be the tussle between Ronaldo and Kaka, surely the two hottest properties in football at the moment (although that will no doubt offend the Messi camp).

Both sides are strong in all areas - although there are undoubted weak links, Milan's age and United's injury problems, but will go as far as the pairing will carry them. Ronaldo, playing slightly wider and cutting in has more pace, is trickier and frightens defences whilst Kaka, coming from deep will play almost as an auxilliary striker, protected by a bank fo three midfielders behind him. Not as pacy as Ronaldo, he is nonetheless quick and strong, he is a creator and also capable of scoring important goals at important times.

Ronaldo is expected to walk away with PFA Player of the Year award in the EPL and his progress this season is remarkable, even managing to eclipse the no less than considerable talents of a certain Wayne Rooney. Without him in their line-up, it is doubtful that United would have the lead they enjoy in the EPL.

With the loss of Shevchenko and the points deduction, Milan have stalled at times this season and struggled to replace the goals of 'Sheva', but with Kaka in the line-up he is compensating in other areas and helped Milan come to party at a time of year they generally come alive.

There is a feeling in both camps and media alike that these are the two players the other side fears most and will set about stopping above all else, and whilst not the only contest in this tie, it is the one battle that you feel will ultimately play a large part in deciding the outcome of this contest.