Tottenham have announced the signing of German under-21 captain Lewis Holtby.
A statement on the clubs website read:
"We are delighted to announce that we have reached agreement with Schalke for the immediate transfer of Lewis Holtby."
The club had already agreed terns with Schalke for Holtby to move to London in the summer but after Sandro was ruled out for the rest of the season Spurs looked to bolster their midfield options and bring the player in now.
Holtby has made 27 appearances for the Bundesliga side this season scoring four times.
Capped on three occasions by the senior German national side, the versatile midfielder joined Schalke in 2009 from Alemannia Aachen and was loaned out to Bochum and Mainz prior to making his breakthrough with the Gelsenkirchen-based club.
Lewis has made 160 appearances in his career to date, scoring 29 times.