European chief Martin Spiess has conceded in a new interview that the publisher are somewhat concerned by the performance of the console in Europe.

Spiess is worried the system may be falling behind its competitors.

"I don't know what it's like for other companies, but the market is not as big as the market, so naturally we have lower attachment rates," Spiess offers.

"But it could be growing to the same size as the US - the only problem we have right now is that we see in certain territories is lagging behind. has become very strong, has become very strong, but the Microsoft market in certain territories is concerning."

By Luke Guttridge