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Even though Arsenal's match was quite good last week, it will not necessarily be easy against Sevilla later. Even though Sevilla in the local or last match did not show their best players, of course Sevilla will not remain silent in the next match. Playing with full support from the audience will definitely be an encouragement for the team, or as additional ammunition (stamina), yes of course Sevilla will have a surprising impact in the match because Sevilla will reduce the point score in the standings.
I don't know how good Arsenal's performance was in the previous match against Lens, I mean they had to admit defeat 2-1 in that match. Then from that, Arsenal was forced to play a draw after they didn't want to lose to Chelsea in the Premier League. Arsenal's performance tends to decline, but this team has a better mentality than last season.
Sevilla is a team that is unbeaten in its 5 home matches so far, of course that is a record in the Champions League and La Liga. Yesterday Sevilla drew against a strong team (Real Madrid), so they really cannot be underestimated when they meet Arsenal in the next few days. Sevilla can threaten Arsenal at home, that includes beating them.