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UEFA rejected the appeal of London coach Arsene Wenger regarding his two-match disqualification.
The Frenchman was punished for communicating with the reserve bench while already being punished and sitting in the stands during one of the colleagues' coaches.
Wenger will not be able to lead the Arsenal team in the first group stage matches against Dortmund's Borussia and Piraeus's Olympiacos.
In addition, the London club will pay a fine of 10 thousand euros.