Wembley Stadium is investigating after fans got wet under a leaky roof at the new £800m venue.
Fans had to be moved to drier seats. Picture by Tim Fuell
About 50 Supporters at Saturday's FA Trophy final had to be moved to different seats at the north London stadium because they were getting wet.
A Wembley spokesman said the leak would not affect this Saturday's Manchester United versus Chelsea FA Cup final.
Last week Wembley said it had to replace about 10,000 red seats as they had faded to pink in the sunshine.
Tim Fuell, one of those who had to be moved during the game between Kidderminster and Stevenage, told BBC London: "It just got heavier and heavier.
"It started torrenting down the back of the stand and down the stairwell.
"We were able to move to spare seats but obviously they can't do that next week for the cup final or England v Brazil games that will be sell-outs."
In a statement, Wembley Stadium said: "We are aware of a small number of fans getting wet this weekend and are looking into it.
"We have been assured by experts that the problem can be rectified for Saturday's cup final."
Stevenage beat Kidderminster 3-2 to lift the FA Trophy.