Citizen TV Senior Reporter Stephen Letoo lost Ksh50,000 following Arsenal's defeat to Manchester United.
Letoo, who is an ardent Arsenal supporter, had placed a bet with a friend on the match.
According to their agreement, whoever loses was to pay the other Ksh50,000.
"Last night I lost a Sh50,000 Manchester United Vs Arsenal bet to Grand Mullah Kaizer... Why Arsenal? Why?" the news reporter wrote on Facebook.
Earlier before the match, Letoo had exuded confidence that Arsenal would beat Manchester United.
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"Every Arsenal game has been a must-win since we beat those zebra crossing tea...Wekea Arsenal kichwa kisha ulalae (just bet for Arsenal to win and then retreat to sleep)," he said.
Kaizer confirmed winning the bet even as he laughed at the Citizen TV reporter for claiming victory even before the real match.
Arsenal succumbed to a 3-1 defeat to Manchester United at Old Trafford on Thursday night.
Two goals from Cristiano Ronaldo and one from Bruno Fernandes were enough to sink Arsenal who only managed to pull two back through Martin Odegaard and Smith Rowe.
Arsenal were first to score through Rowe before Fernandes cancelled the lead resulting in a 1-1 score at half-time.
Ronaldo netted the second goal for United but his effort was equalised by Odegaard.
A foul on Fred inside the box saw Ronaldo put united on the lead once again through a penalty kick and seal the three points for the home team.
Manchester United, however, still trails Arsenal on the table standings. Man U are 7th with 21 points while Arsenal are 5th with 23 points.
Ronaldo reached a huge milestone in the match after netting his 801 career goals, thanks to the two goals.