He joins as part of the deal that sent Louis Saha to Tottenham.
Pienaar left Everton for Tottenham last summer, but like many signed by Harry Redknapp soon found himself out of favour.
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Chelsea legend Didier Drogba has revealed his top 11 Chelsea career moments during his recent interview on Chelsea TV.
The start of the 2017-18 Premier League season is just around the corner and is shaping up to be one of the most competitive yet.