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
Around 760 out of the 4,200 foreign offenders living freely in the UK have disappeared from sight, according to a leading watchdog.
Schools and nurseries are being called on to help check children have brushed their teeth.
Changes in gait could prove to be an early sign of Parkinson's disease, according to a new study.