Arsenal boss Mikel Arteta reveals concerns with Champions League win over Slavia Prague

Mikel Arteta admitted he was "very concerned" by Arsenal 's second-half performance against Slavia Prague , despite the fact his side picked up all three points. The Gunners were cruising at half-time of the Champions League clash, leading 2-0 through goals from Noni Madueke and Viktor Gyokeres . It could have been an even bigger advantage, too, with Mikel Merino and Eberechi Eze both having good chances to get on the scoresheet themselves . However, there was then a significant drop-off after the break.