Cardiff's remaining two fictures are against Clyde on Fridday July 26th and at Motherwell on Sunday July 28th. There is no news yet regarding these fixtures but it's thought the local police are unhappy that Cardiff, Millwall and Birmingham are all due in the Glasgow area at the same time.
St Mirren and Millwall have already issued statements.
St Mirren said
After due consderation and consultation with the local Police, the
previously announced home friendlies against Cardiff City and
Millwall have been cancelled.
This leaves one remaining friendly against Norwich City on 13 July at
the time of this article. The club is looking to replace the
cancelled matches with other fixture(s) and will advise such
arrangements in due course.