Maresca ‘not worried’ by Guéhi’s gaffes as Aston Villa end City’s flawless start

<ul><li><p>Defender costs three goals in past two league matches</p></li><li><p>Emery praises ‘fantastic’ match-winner Jackson</p></li></ul><p>Enzo Maresca is not concerned by the form of Marc Guéhi despite the defender costing his si