Cittadella will face Benevento in the Serie B promotion play-off semi-final after their surprise 2-1 win away to Spezia.
The one-off match was decided by a brace from Gabriele Moncini, around the temporary Giulio Maggiore headed equaliser.
Moncini thought he’d completed a hat-trick, but the third goal was ruled offside using VAR.
Cittadella will now face Benevento in the two-legged semi-finals on May 21 and 25.
On Saturday, Verona take on Perugia for the right to play Pescara in the other semi-final on May 22 and 26.
Spezia 1-2 Cittadella
Moncini 22, 66 (C), Maggiore 52 (S)