Former Arsenal midfielder Paul Merson has made a shock promise to fans ahead of Manchester City’s trip to face Tottenham Hotspur. Arsenal will be watching on intently on Tuesday evening when Tottenham Hotspur host Manchester City. The Gunners kept their Premier League title dream alive with Sunday’s win over Manchester United at Old Trafford. However, Mikel Arteta’s side need Manchester City to drop points at the Tottenham Hotspur Stadium in order for the destiny of the title to be in their own hands on the final day of the campaign. Arsenal fans made the most of their win at Old Trafford, but…