Alvaro Morata provided the lone goal in Chelsea's 1-0 win over Vidi in Europa League group-stage action on Thursday.
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Werder Bremen announce the signing of Hungary midfielder Laszlo Kleinheisler from Videoton.
Celtic eased past Stjarnan in their Champions League second-leg qualifier, while Astana upset Maribor to progress through to the next round.
Two of last season's Champions League group-stage underdogs got off to a rough start in the first leg of the second qualifying round on Tuesday.