Napoli missed the chance to move level with second-placed Roma in Serie A as they lost 1-0 at Torino on Sunday.
Fiorentina beat Inter Milan 1-0 to remain clear of Sampdoria in Serie A's final European place.
Ronny Deila has challenged his Celtic team to make history when they take on Inter Milan in the San Siro.
Ronny Deila lamented the referee after his side exited the Europa League following a 1-0 defeat at Inter Milan.
Inter Milan made it three Serie A wins in a row with a hard fought 2-1 victory over Cagliari on Monday.
Inter Milan battled to a third straight Serie A win, 2-1 at Cagliari, while third-placed Napoli beat Sassuolo 2-0 on Monday.
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