The Yorkshire giants edged out Premier League outfit Burnley on penalties on Tuesday night to book their place in the fourth round of the domestic cup competition.
A spokesman for Burnley said: "The club are aware of the problem".
Ladbroke's are Burnley's official United Kingdom betting partner, but took to Twitter to taunt their players.
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It was chose to take the penalties in front of Burnley supporters, rather than the end holding a large travelling contingent of Leeds fans, who had barracked former players Charlie Taylor and Chris Wood.
"We would also like to apologise to any fans that took offence".
Wood and Taylor featured against their former club in Lancashire, with the former netting an 89th-minute spot kick to take the match to extra-time with the scores level at 2-2.
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Speaking after the defeat, the Burnley manager, Sean Dyche, said he was disappointed to hear Wood and Taylor being targeted by their former fans, adding: "It's a unusual business, football".
"It's a unusual business, football", said Dyche, after his side were knocked out by their Sky Bet Championship opposition. 20-odd million they've made for a club (in transfer fees) and they get slaughtered.
He said: "Before I came here I knew about Leeds, I've followed English football since I was a kid and I knew Leeds were a big team".
Those two have been fantastic servants to Leeds, if I'm honest.
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