Millwall football manager Kenny Jackett said he had not seen incidents of crowd trouble at today's FA Cup semi-final, but added:
If there was crowd trouble ... It will hold us back if that happens repeatedly.
We have worked very hard, the chief executive and chairman, to do everything we possibly can to be trouble-free. We have had high-profile games that have gone very well. We have done everything we possibly can.
More top news
Tuesday: After a bright start, rain will gradually push northeastwards across England and Wales with strong winds developing.
Britain should have a second vote on the terms of exiting the EU if it can secure a new deal to control its borders, Jeremy Hunt has said.
Complaints have been lodged with the chairman of the 1922 committee over the neutrality of government whips.