Career
On 11 February 2014 Football Club announced that they had signed Callà in a swop deal with Football Club Aarau. Stephan Andrist signed for Aarau with a contract dated up until June 2015 and at the same time Callà signed for on a 2 1⁄2-year deal. They also reached the final of the 2013-2014 Swiss Cup, but were beaten 2–0 by Zürich after extra time. had qualified for Europa League knockout phase and here they advanced as far as the quarter-finals.
The season 2014-2015 was a very successful one for Callà and for Football Club. But for the third season in a row, ended the competition as runners-up, losing 0–3 to Football Club Sion in the final. entered the Champions League in the group stage and reached the knockout phase as on 9 December 2014 they managed a 1–1 draw at Anfield against Liverpool.
But then then lost to Porto in the Round of 16. played a total of 65 matches (36 Swiss League fixtures, 6 Swiss Cup, 8 Champions League and 15 test matches).
Under new manager Paulo Sousa Callà totaled 49 appearances, 23 (seven goals) in the League, 6 in the Cup and 5 in the Champions League, as well 15 in test games (one goal.