The 27-year-old was loaned out by then manager Frank Lampard and during his loan spell he scored three goals in 24 appearances.
In his absence, Tuchel replaced Lampard and won the club's second Champions League trophy with a 1-0 final victory over Manchester City.
Therefore it was Barkley's first training session under Tuchel as he hopes to impress the German on his return to the club.
The midfielder had a mixed spell at Aston Villa during his year-loan spell at the West Midlands club.
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