Arsenal forward Pierre-Emerick Aubameyang has expressed his frustration at UEFA regulations which prevent him from playing in the Europa League.
The Gabon striker scored his third goal in five Premier League appearances for the Gunners during Sunday's 3-0 win over Watford.
However, he is unable to represent Arsenal in the Europa League because his former club Borussia Dortmund dropped down in the competition from the Champions League.
Aubameyang is effectively cup-tied despite not playing in the Europa League this season, and the striker has been forced to miss both legs against Ostersund as well as the trip to face AC Milan last week,.
"I am really frustrated because the rules are a bit - I don't know how to say in English but I am disappointed because I can't help my team," he told Sky Sports.
"That's life. I have to deal with it. I can't play every three days. When I was in Dortmund, I was playing every three days but now I play once a week or have a long time between games. It is not easy."