Despite he was 19-years-old according to UEFA rules, a team could take a maximum of three players born between 1 January 1996 and 31 December 1996 and Laçi managed participate with Olympiacos U-19 in another season 2015-16 UEFA Youth League.
In the 2015-16 season Laçi took part with Olympiacos first team against Dinamo Zagreb on 20 October 2015, match valid for the 2015-16 UEFA Champions League group stage, where it was his first match to participate in a major competition such as the UEFA Champions League [REF].