Vidal arrived back from holiday earlier this week and joined his new team-mates for the evening training session at the Ciutat Esportiva Joan Gamper.
It was there that the former Sevilla right back crossed paths for the first time for the other new signing, Arda Turan. The Turkish international, who arrives after four seasons at Atletico Madrid, began training with Barcelona on Monday.
Turan is currently the most expensive La Liga transfer of the summer after joining Barcelona on a £24 million move from Atletico Madrid.
The Turkish international has signed a five-year contract with Barcelona but will be unable to play until January due to the La Liga champions transfer ban.
The 28-year-old is expected to join Barcelona on their summer tour of the US and participate in the Intercontinental Champions Cup.