Tottenham have handed out "indefinite bans" to three season ticket-holders who listed their Champions League final tickets on a resale website, reports BBC Sport.
Since 1994 it has been illegal for an unauthorised person to sell on tickets.
Spurs asked fans not to "ruin one of the biggest occasions in the club's history by selling on your ticket and profiteering from fellow fans".
The Premier League club also said they would cancel match tickets if they were found to have been sold on by supporters after collection.
"Once again, we wish to remind all our supporters that any ticket purchased is for the sole use of the individual that purchases it from the club," read a statement.
"Transferring or selling tickets on unofficially breaches our terms and conditions and is against the law."