Then the Gunners are not in action again until they host Leicester City at the Emirates Stadium on October 22, so if Emery's three-week prognosis proves to be accurate Cech could resume the campaign against Claude Puel's men.
Asked whether Leno's next task was to prove he's ready to start every game, Emery said: "Yes, he has convinced me but not now [in this particular match]". Emery said: "I think, knowing this team, and why we now have 15 points, is because they are a very organised team and very competitive, finding their best performance with very good players".
Unai Emery, the Arsenal head coach, intends to keep playing Aaron Ramsey despite a club decision to withdraw a contract offer that will nearly certainly lead to the midfielder's departure next year. "He has waited for his moment".
Two minutes later Iwobi was back at it again, dropping a pass on the path of Lacazette, who teed up Mesut Ozil for the match the victor.
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'Of course I didn't play so many games, but my feeling was very good and I feel like the team is very nice.
Arsenal have won their last six matches in all competitions unlike Watford, who have not won in their last three, but Emery offered words of praise for his opposite number Javi Gracia. "But this passage was necessary today and I think our players on the pitch in the first half were a little nervous and we need to continue being calm".
"The ball was near our box a lot, the rhythm of the match was not what we wanted".
'It was a hard start when you don't think you're going to play and then Petr is injured - I hope he will get well soon, ' said Leno.