In 2004 Rasiak signed for Italian club Siena, but because of a change in managment his contract was terminated before playing a single match. The Polish striker singned for English Championship (2nd division) side Derby where he made a very good impression and earned himself a move to Premiership side Tottenham. Grzegorz Rasiak's move to Tottenham from Derby was finalised minutes before the close of the summer transfer window. It is believed that Spurs paid £2million for the striker.

However, his time at the London club has not been good and Rasiak has once again found himself in the Championship, this time with Southampton.