Arsenal are planning a major expansion of the Emirates that could force them to move their home matches temporarily to Wembley Stadium. Detailed work has gone into a potential overhaul of the north London stadium that would increase Arsenal’s current 60,700-capacity to beyond 70,000. It would restore the club’s standing as the biggest ground in London, overtaking West Ham United and rivals Tottenham Hotspur. It is understood the club have options to change the gradient of the stands and can also adapt the seating plan to fit in more fans. The outer bowl, however, would remain similar in appearance as the majority of developments being assessed would come inside the ground. Arsenal, though, will be well aware that Real Madrid doubled their matchday income following their recent upgrade to the Bernabéu, which generated €241m (£210m) in the most recent accounting year. Industry experts believe that a comparably steep year-on-year increase is feasible. Arsenal are restricted by...