The FA Cup semi-final weekend will be affected by urgent safety checks on trains running on the Metropolitan line section of the Tube.
There will be disruption for weeks with the introduction of a special timetable.
Wembley Park station is served by the Met Line.
The first semi-final is on Saturday, with Manchester City taking onLiverpool.
A TfL spokesman said that they are currently inspecting the whole Metropolitan line fleet and will have more certainty of the impact for the weekend in the coming days.
We are working with the FA to see if there is any impact to event day services.
Travel advice will be communicated ahead of the matches, but customers should check before they travel and consider alternative lines.
Between Baker Street and Amersham and Chesham, there are trains every 30 minutes.
The tickets were being accepted on the trains.
Fans can take the Jubilee line to Wembley Park or the Bakerloo line to Wembley Central station.
The Tube disruption is bad news for fans of Manchester City.
They argued that a lack of train services would cause price fans out of the game and lead to extra journeys on the motorway.
The FA has resisted calls to switch the venue, instead trying to reduce travel disruption through talks with Network Rail, National Express and National highways.
The FA said in a statement last month that up to 5,000 Manchester andLiverpool City supporters will be able to travel to Wembley Stadium free of charge because of one hundred free return bus journeys.
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