Sevilla sports chief Monchi says Chelsea's young team is one to watch.
The two teams met last week in their opening Champions League group game, drawing 0-0.
Monchi said: "I don't trust the money Chelsea spent, but I trust the players for whom they spent it on.
"From midfield up they have great talent: Pulisic, Ziyech, Abraham, Werner ... They are a very high level team, although still in the running-in phase. They are building as a collective and will still need some time, but they remain a formidable rival.
"On their side, then, they will have the emotional aspect: last year's elimination against Bayern was really bad and they will want to cancel it (in Europe)."
