Leno made saves from Troy Deeney, Andre Gray and Isaac Success and to preserve the clean sheet to help Arsenal beat Watford and secure a seventh successive win in all competitions.
Ramsey whose contract expires at the end of the season looked set to extend his stay with a new deal.
Alex Iwobi had a hand in the opening goal of the match when his squared ball bounced off Craig Cathcart and into the back of the net.
Do you think Arsenal should drop Ramsey for the game against Fulham next week?
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Explaining his own exit earlier this month, Gazidis - who was instrumental in the appointment of Emery - said: "I know many will think this is a unusual time to be leaving but I believe it is the right time for me and for the club". He has waited for his moment and it's arriving'. "They are professionals for 10, 12 or 15 years but not more and they need to take the best performance and also work very hard in these years for their future and their family's future".
On Cech's injury, the Spanish coach explained: 'Tomorrow I will know more.
In the fifth minute, Lacazette ran in on goal and was unlucky not to win a penalty when he was brought down in the area by Watford defender Christian Kabasele.
Ozil was then handed the armband after Ramsey was substituted and the Welshman was evidently not happy with Emery's decision. All the players are frustrated because they think we will be able to get a good result playing here.