Clarke Oduor's Barnsley manager Valerien Ismael has stated he was disappointed by the manner in which they conceded three goals against Cardiff City on Tuesday.
Cardiff City picked up a 3-0 win to record a first home victory in the Championship as Oduor's side were beaten for the first time under their new manager.
The Bluebirds got the goals thanks to Junior Hoilett's close-range finish, as well as efforts from Joe Ralls and Harry Wilson.
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Neil Harris' charges had only scored two points from four home matches before Barnsley's visit.