Cape Town - Valencia coach Albert Celades admits his charges will need to put in a big performance against Chelsea in their Champions League encounter on Wednesday.
The sides will square off at the Mestalla in match-day five of Europe's elite club competition with nothing between them in the Group H standings.
Ajax are top but level with Los Che and the Blues on seven points, meaning it is still all to play for.
The victors will earn a spot in the last-16, with the Amsterdam giants set to play basement club Lille away from home in midweek.
Valencia secured a shock 1-0 victory over Frank Lampard's side at Stamford Bridge on September 17 as Spain forward Rodrigo scored the only goal of the game.
The Spaniards are on home soil this time around but Celades is wary of the threat that the Londoners possess in all areas of the pitch.
"Chelsea have very good players, not two or three, a lot of good players," he told reporters ahead of the game.
"They play with big intensity and I think at the moment they are one of the best in Europe.
"They are playing very well. Watching the game against Manchester City you can understand the things they can do."
Valencia are not enjoying the best of times domestically in 2019/20 and a 2-1 defeat to Real Betis at the weekend left them in 10th place in the La Liga standings.
Chelsea also went down last time out, losing 2-1 to Premier League champions Manchester City at the Etihad Stadium.
- TeamTalk Media