Becchio missed United's 2-1 FA Cup third-round replay victory at Birmingham, with twitter rife with reports the 29-year-old was at Dean Court to see Wigan defeat Bournemouth.
"I've heard the rumours but I think he has texted Shaun Harvey (Leeds chief executive) to say he is at home," said Warnock.
"So he's obviously heard the rumours."
He added: "We lost Becchio this morning, he came off training yesterday and said he felt sick. And then the doc said the morning he was sick in the night so he didn't travel."