They aren't registered with no team and can't form part of the referee's act
Bad news for Aleix Vidal and Arda Turan. FIFA has reminded Barça that the 2 signings of this summer may not play any preseason friendly match this summer. Neither Gamper nor the tour of the United States and Florence (Italy).
The reason is that the 2 players aren't enrolled in any team because FIFA sanction denies it. Because they aren't registered, they can't appear in any referees act and they will see all matches from the stands.
The official debut could be 3rd Jaruary 2016 against Espanyol
The only solution Aleix Vidal and Arda Turan can play a friendly match should be a training match organized by Barça without referee's act. Last year, Barça did a match at the Ciutat Esportiva against a selection of Thailand Under-19 to be able to play Vermaelen and Luis Suárez.
The difference with Suárez
Suárez, that could play Gamper last year with Barça because sanctions affected only to him and not the club. The footballer was already registered as a Barça player but he had to overcome a sanction of 4 months for the bite to Chiellini in the World Cup.
Thus, the debut of Arda Turan and Aleix Vidal in a game will be postponed until 3rd January 2016, when they will be registered and will enter in the first list of Luis Enrique for the match against Espanyol scheduled for that day.