In my opinion, Atalanta are not very strong this season, they have just suffered two consecutive defeats in Serie A. Arsenal, who are performing well, are one level above Atalanta, but Arteta must remain focused by fielding his best squad in order to achieve victory. Atalanta were so easy to beat in Serie A, they are very difficult to repeat the success achieved in the Europa League last season. Arsenal have always been consistent in maintaining their performance, especially this season their motivation is increasing to win the title, so Atalanta will not be too difficult for Arsenal.
What has happened in Serie A this season to the Atalanta team should not be taken entirely as a judgment because Atalanta could have given their best game in the Champions League this season although I also do not imagine Atalanta could beat opponents like Arsenal easily. Because in the Champions League all teams will definitely put all their best abilities into play in order to win, especially this season each team will go through a different way in the Champions League which will require each team to develop a more precise strategy.