Watch: Messi and Barca gear up for Juve UCL clash days after shock Cadiz defeat

Barcelona will only surrender top spot to Juventus if they lose by three goals or more, or by any two-goal margin other than 2-0.

Madrid: Barcelona trained on Monday, a day before they face fellow European heavyweights Juventus in a battle to see who will finish top of UEFA Champions League Group G.

Although they have struggled in the Spanish La Liga with four wins from 10 matches, Ronald Koeman's side have won all five of their group games in Europe, which included an impressive 2-0 victory in Turin towards the end of October.

Barcelona will only surrender top spot to Juventus if they lose by three goals or more, or by any two-goal margin other than 2-0.

Forward Ousmane Dembele suffered a hamstring injury during Saturday's shock league defeat at Cadiz.

The France international joins Ansu Fati, Gerard Pique and Sergi Roberto on the treatment table, while defender Samuel Umtiti remains a doubt with a knee problem despite training.