England coach Roy Hodgson on Thursday urged the football authorities to beware of neo-Nazi groups trying to cause trouble at matches.
UEFA has proposed new, tougher anti-racism sanctions from next season, including a partial closure of stadiums for a first incident of racist abuse by fans - rather than just a fine - and a full closure for a second offense.
FIFA President Sepp Blatter, meanwhile, has backtracked on calls for teams to be punished with relegation after serious racist abuse over fears fans would deliberately provoke incidents.
Hodgson, who has also coached in Sweden, Denmark, Norway, Switzerland and Italy, appears to share Blatter's concerns, highlighting the danger of far-right extremists.
"The one thing that concerns you a little bit is what happens at the stadium, it's very difficult to control every element,'' Hodgson said at the SoccerEx conference in Manchester. "One does fear sabotage, with groups of people coming in who have nothing to do with football and who are perhaps of a Nazi persuasion and who could cause an awful lot of problems.''
Hodgson didn't specify which countries he thought might be afflicted by the trouble.
FIFA's punishments only apply to its international competitions, and UEFA can only enforce its sanctions in European fixtures.
UEFA, though, is asking its 53 members at next month's congress to adopt the proposed tougher anti-racism sanctions that include a 10-match minimum ban for players found guilty of abuse.
The English Football Association, which is hosting the congress, isn't sure if it wants to emulate European football's governing body.
"We wouldn't necessarily get to the same solution as UEFA,'' FA chairman David Bernstein said. "It's not a race to be first past the post, we'll do it at our own pace in our own way.
"I'm delighted UEFA have come up with this strong penalty and I fully support them doing it. But English football must come to its own decision in its own time, which will be very soon.''
The moves follow two high-profile incidents in England in recent seasons, with Liverpool striker Luis Suarez receiving an eight-match ban for racially abusing an opponent and Chelsea captain John Terry being suspended for four matches for the same offense.