Andrew Robertson is set to miss Liverpool's Champions League clash with Napoli.

Robertson is a doubt for Liverpool's Champions League clash against Napoli on Tuesday night.

Jurgen Klopp told Liverpool's official website: "Robbo didn't train today and we have to see.

"It is not a major thing, it was more precautionary today, but it is not 100 per cent sure [he will be available].

"We will have to test it tomorrow and then we will see."

Initially it was reported that Robertson had been cleared as he had travelled with the squad but he missed training on Monday morning with a slight knock.

The Reds sold Alberto Moreno in the summer and did not sign a back-up left-back.

This means James Milner or Joe Gomez is likely to play in defence if Robertson can not overcome his knock in time.