TEAMS caught using players under fake names face being kicked out of the Worcester and District League.
The warning has come after Sunday Division Three side Alumni were fined £150 for trying to pass off Jordan Stoddart as one of their own players.
Stoddart was already registered to Premier Division outfit Arrow 2000 when he scored twice in Alumni's 7-3 victory over Metro.
Alumni, second-from-bottom in the table, admitted deliberately falsifying a team sheet and hit with the fine.
League secretary Tim Phillips has vowed to clamp down on teams trying similar tactics in the future and said they run the risk of being kicked out of the competition.
"We will not tolerate this type of offence and any club caught doing it will be severely dealt with and could even face expulsion from the league," he said.
The match was replayed last Thursday and finished 0-0. That point was enough to earn Metro promotion to Division Two with champions Brewers Athletic on goal difference from third placed Falcons.
Meanwhile, there will be 68 teams taking part across the six Sunday divisions next season, three fewer than this term.
Although nine new teams are set to join the league, 12 of the 71 that started out in 2013-14 have withdrawn.
Despite the net decrease, the competition is still in relatively good health, according to Phillips.
It was announced last week that the Saturday division would be discontinued for the first time since 1893 due to a lack of teams.
The Kidderminster and District League's Saturday competition has also folded for the first time in more than 120 years.
Elsewhere, Hereford United player-of-the-year Daniel Lloyd-Weston is to quit the club over unpaid wages.
The 22-year-old keeper, who made 28 appearances for the Bulls this season, has given the club 14 days notice for failing to honour the terms of his contract He was offered a new deal by the club for next season but has notified the Football Conference and Football Association that he intends to become a free agent.
Lloyd-Weston, who had trials at Manchester United as a youngster, said: "It’s a tough decision as I have really enjoyed my time with the players and the coaching staff, sometimes working in very difficult circumstances, but with fantastic team spirit, magnificent support from the fans and the wider football community.
“The off-field issues have been well-documented and I’m very disappointed, but I have to put it behind me, now looking to further my career at another club.”
However, mystery continues to surround proposed investment in the Edgar Street club.
According to chairman David Keyte, an agreement has been reached with an unnamed group to "take a leading role" in the club.
However, no further details have been released regarding the group's identity or how much money they are putting in.