Both English Premier League football matches in London on Boxing Day are under threat as a result of a planned strike by underground drivers.
Arsenal have sold all 60 thousand tickets for their match at home to Wolves but access to the Emirates Stadium for fans and the club's 1,000 match-day staff could be hampered if the 24-hour strike that day goes ahead.
London mayor Boris Johnson is pursuing a legal challenge against the strike but if that move, or further talks, fail to halt the industrial action, Arsenal could delay the Wolves fixture by 24 hours.
Chelsea's west London derby against Fulham on Boxing Day could also be disrupted by a shutdown of the 'tube'.
