Urgent safety checks being carried out on trains running on the Metropolitan line section of the Tube will affect the FA Cup semi-final weekend, Transport for London (TfL) has warned.
The entire fleet is undergoing a "detailed inspection" after a fault was found with train wheels.
TfL has introduced a special timetable - with disruption expected for weeks.
The Met Line serves Wembley Park station and TfL warned disruption would impact FA Cup semi-finals this weekend.
Manchester City take on Liverpool in the first semi-final on Saturday, with Crystal Palace playing Chelsea in Sunday's tie.