Marcos Alonso's late header helped Chelsea to a hard-fought 1-0 win away to Slavia Prague in their Europa League quarterfinal first leg on Thursday.
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Arsenal have been handed a difficult draw against Serie A side Napoli in the quarterfinals of the Europa League.
Liverpool earned a first-leg away win at Hoffenheim while CSKA needed a fortunate own goal to edge Young Boys.
Werder Bremen have completed the signing of Slavia Prague goalkeeper Jiri Pavlenka.
Werder Bremen have agreed a deal to sign Slavia Prague goalkeeper Jiri Pavlenka, the Bundesliga side have announced.