Gareth Bale is "not producing" for Jose Mourinho, according to Dimitar Berbatov, who says Tottenham may have to send the Welshman back to Real Madrid.
Bale has struggled for regular minutes and full fitness since returning to Tottenham on a season-long loan from Madrid in September.
The experienced winger's first spell at Spurs came to an end when he joined the Blancos for a then-world record fee of £85 million ($116m) in 2013, and he went on to score over 100 goals at Santiago Bernabeu while also earning two Liga winners' medals and four Champions League titles.