Lincoln represented Gibraltar for a third consecutive time next season. In the first qualifying round, they were drawn against FC Flora from Estonia. In the first leg on 28 June at A Le Coq Arena in Tallinn, Chipolina scored an away goal in a 2–1 loss. Eight days later in the second leg, a Chipolina penalty and another goal by Antonio Calderón gave the team a 3–2 aggregate win. In the next round, Lincoln faced Celtic, champions of Scotland and 1967 European champions. They won the home leg 1–0 on 12 July, Casciaro scoring the only goal after 48 minutes, but lost 3–0 at Celtic Park eight days later.