Tottenham manager Mauricio Pochettino has joked that the club may have to cover the see-through tunnel in their new stadium following a fracas at Old Trafford after Sunday's Manchester derby.
United manager Jose Mourinho was upset by the behaviour of the City players who threw milk and water at him following the 2-1 Premier League win.
Meanwhile Manchester City coach Mikel Arteta suffered a cut to his head as a result of the incident.
Tottenham's 61,500-seat stadium plan includes a glass-walled suite similar to that in City's Etihad stadium that will allow supporters to watch players before they step on to the pitch.