Sydney FC outcasts Nicky Carle and Matt Thompson will return to training with the senior team on Thursday morning after the club lifted the training ban imposed on the pair following lengthy discussions with the players' union.

The veteran midfielders had been in isolation from the rest of the squad since Monday morning for being "negative influences on the playing squad" though Fairfax Media understands that the coaching staff was also annoyed with alleged tactical dissent during Saturday night's 3-0 loss to Adelaide as Carle and Thompson were judged to have swapped roles.

Though, the PFA was informed by the club that Thompson and Carle were disciplined due to their negative attitude and influence within the squad.

"The only correspondence the players received as well was that they were negative influences on the playing squad," a PFA spokesman said.