According to reports, the England international is set to sign for last season’s LaLiga runners-up in a surprise switch.
Tripper made 38 appearances last term as Tottenham reached the Champions League final – which he played in – and finished fourth in the Premier League.
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However, after the European Cup final defeat by Liverpool, the defender admitted he wasn’t sure if he would see out the rest of his contract with the club – which runs until 2022 – amid reported interest from clubs in Spain and Italy.
The 28-year-old was hailed for his performances for England at the World Cup in Russia last summer, but has struggled to live up to those high expectations over the past 12 months for Spurs and it appears he could be on the move after a disappointing campaign.
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Nevertheless, Gascoigne is surprised Spurs are letting Trippier go for such a small fee, especially compared to some of the crazy transfers being completed in the current transfer market.
Speaking to talkSPORT host Jim White on Wednesday, Gazza said: “He’s a good player and it’s a good move for him, a big move.
“But I just can’t believe he’s going for £21million [sic]!
“Some of the players are going for so much nowadays, it’s ridiculous.
“Some of them can’t even trap a bag of cement, honestly!
“But it’s another good player having the chance to play abroad. I did it, but whether he’ll do as good as me, who knows?!”
Listen back to Jim White’s interview with Paul Gascoigne IN FULL above