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Real Madrid keeper Iker Casillas believes no Premier League club will pose a threat to his side's attempt to retain the Champions League this season.
Manchester City and Liverpool both face a fight to seal their place in the last 16 this week, but Chelsea have already progressed as winners of Group G, while Arsenal are also through to the last 16.
Chelsea, who reached the semi-finals last season, are considered to be England's best hope of success this term following an impressive start to the campaign.
Manager Jose Mourinho did not enjoy the best relationship with Casillas during his three-year spell in charge at the Bernabeu between 2010-13, but the Spain keeper is not worried about facing his former boss in the competition.
He believes the threat will come from elsewhere for Madrid, who currently lead La Liga and have won 18 successive games in all competitions.
Casillas said: "I think we will have to go right until the end to fight for the league. But our main rivals in Europe? Bayern Munich and Atletico Madrid (who they beat in the final in May)."
Should Madrid claim the trophy again in Berlin next June, they will be the first side to have won the Champions League two years in a row.
Meanwhile, Mourinho is expected to make a number of changes to his first team for their final group game at home to Sporting Lisbon tomorrow night.
Loic Remy, Filipe Luis, Petr Cech, Kurt Zouma and Andre Schurrle are all expected to start and give some regulars a much needed rest.
