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The Bayern Munich player was put on the transfer list earlier this month, sparking interest from several Premier League clubs.
Eintracht Frankfurt, Arsenal, Chelsea and Manchester United were all linked with Tel, but Spurs were keen to secure him on a permanent deal.
However, Tel initially rejected the move to Tottenham, despite an agreed fee with Bayern.
In the days that followed, staying at Bayern or moving to Man United seemed equally possible.
Joining Tottenham means Tel will become part of Postecoglou's squad alongside fellow late addition
Instead, Disasi has joined Aston Villa from Chelsea, while Crystal Palace turned down Spurs' impressive $87million/£70million offer.
With his move now confirmed, the focus shifts to the impact he could make, with many hopeful it could be as soon as the Carabao Cup semi-final second leg against Liverpool
Since he hasn't featured in the competition for another team, he's eligible to play and will likely start on the bench.
A full debut is more likely to come later this month in Premier League action against Manchester United after Spurs face Villa in the FA Cup fourth round this Sunday
With the home match against Ruben Amorim's side not scheduled until Sunday, February 16, Tel should have ample time to settle in.
There is more bad news on the injury front for Tottenham though after it was confirmed that defender Radu Dragusin was set to miss the remainder of the season with an ACL problem.
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