Liverpool face an all-or-nothing match against Napoli at Anfield in their final fixture of the Champions League group stage.
A 1-0 win or victory by at least a two-goal margin will guarantee the Reds' progress to the knockout rounds, but any other result could mean elimination.
It's a high-stakes clash, and here are three key battles that could help determine the outcome of the tie...
Mohamed Salah v Kalidou Koulibaly
Napoli centre-back Kalidou Koulibaly was unveiled as a contender for UEFA's Team of the Year on Monday and it's easy to see why.