Mikel Arteta has described Granit Xhaka as "one of the signings of the season" ahead of Arsenal's reunion with their former midfielder when they face Sunderland at the Stadium of Light on Saturday.
Arsenal's Premier League momentum has taken a hit after star striker Viktor Gyokeres suffered a hamstring injury that will rule him out of Saturday's trip to Sunderland.
Arsenal defeated Slavia Praha 3-0 in Prague as North London rivals Tottenham Hotspur hammered Copenhagen 4-0 in the Champions League on Tuesday.
Mikel Arteta has admitted Arsenal must remain grounded despite their stunning start to the season, as the Gunners continue to battle on multiple fronts at home and in Europe.
Arsenal striker Viktor Gyokeres has been ruled out of Tuesday night's Champions League clash against Slavia Prague.
Arsenal's defensive star William Saliba has reignited speculation over his future after admitting that a move to Real Madrid would be "tempting".