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Raspadori’s second-half strike gave his side a three-point cushion in second place in Group C ahead of Braga, which lost 2-1 to group leader Real Madrid.

Union gave a good account of themselves at a raucous Olympiastadion but remain pointless at the bottom of the group.

Diogo Leite headed over from an early Union corner and while the early action on the pitch was otherwise flat, the bouncing home fans were creating quite an atmosphere.

Janik Haberer was denied an opener for the hosts after David Datro Fofana, on loan from Chelsea, tricked his way through brilliantly and laid on a close-range tap-in but was then pulled back by a delayed offside flag.

Brenden Aaronson fired woefully over from Sheraldo Becker’s cutback while Napoli’s wing wizard Kvicha Kvaratskhelia was crowded out after some impressive trickery.

Fofana had a shot saved at the near post and then set up Rani Khedira to swing an effort wide.

Napoli attackers Raspadori and Matteo Politano were consistently too ponderous in cutting inside to shoot, allowing the Union defence to stand firm. Fofana headed wide at the other end in the one minute added to the first half.

The start of the second half was, if anything, even less inspiring but Napoli struck in the 65th minute with a goal created by key man Kvaratskhelia.

Mario Rui won the ball well and fed the Georgian on the left. His first cross was cleared back to him but he took on Christopher Trimmel and teed up Raspadori six yards out to finish decisively.

The Italy forward was soon replaced by Giovanni Simeone among a raft of substitutions by both teams – with Fofana looking aggrieved to be withdrawn – before Eljif Elmas, a half-time introduction, curled a shot high and wide with Napoli team-mates in better positions.

Robin Knoche headed Trimmel’s excellent cross just wide and though Union pushed desperately for a late equaliser, there was to be no way through.