The Athletic reported on Friday that Barcelona were still seeking a left-back in the transfer market and Alonso, 31, was one such option.
Tuchel’s side won the Everton match 1-0, with Alonso conspicuously absent from the 20-man squad at Goodison Park.
And after the match, Tuchel was asked whether Alonso had asked to be left out of the squad ahead of a move to Barcelona.
“That is the case,” Tuchel confirmed. “He tried to leave, and we agreed to his wish.
“It wouldn’t have made sense to put him on the pitch today, in this situation it was the right thing to do.”
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Alonso has been at Chelsea since moving from Fiorentina in 2016. The Spain international has made 212 appearances for the Stamford Bridge club, winning the Premier League, Champions League, Europa League and FA Cup.
Barcelona have so far signed Raphinha, Robert Lewandowski, Jules Kounde, Franck Kessie and Andreas Christensen, with the latter joining on a free transfer from Chelsea.
None of those players, however, have yet been registered with La Liga due to Barcelona’s struggles with their salary cap.
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