Along with a free mince pie, and t-shirts given away at halftime, the English champion's Thai owners had printed off 30,000 masks in the image of the team's England international striker Jamie Vardy.
The club, which is struggling in its first league title defense, asked fans to wear the mask in protest at Vardy's three-match suspension, which means he will miss Leicester's festive fixtures.
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Vardy, who sat next to chairman Vichai Srivaddhanaprabha during the game, will also miss the home match against West Ham on New Year's Eve and the trip to Middlesbrough on January 2.
Vardy, Leicester's top scorer last year as the club won its first league title since being formed in 1884, was sent off for a two-footed challenge on Stoke's Mame Biram Diouf on December 17. The Foxes' appeal against his ban was rejected by the English Football Association.
