The BBC host, 43, opened up about getting sacked from talkSPORT only a few days after starting the role at the beginning of his career.
Dan turned up to work and "apologised profusely" after being delayed by an hour and a half due to a terrorist incident.
He had been on a two-week contact with the network in his early twenties, and was sacked on the spot despite the unusual circumstances after he missing his slot.
He told the Express: "I've only ever been sacked from one job. This was years ago when I was 20 or something.
"I got sacked by talkSPORT on the third day in the job. There was a terrorist incident in London - a bomb scare."
Dan continued: "On the third day, I was driving and the police came in front of me and said the road was closed.
"I was an hour and a half late for the programme."
He then revealed that the network controller "didn't believe" him when he tried to explain what has happened.
Dan continued: "The controller phoned me up the next morning and said, 'Don't bother coming in today. You're sacked'."
However, despite the rocky start, Dan's TV career has gone from strength to strength after fronting Football Focus, BBC Breakfast and The NFL Show.
Meanwhile, he welcomed his BBC co-star Louise Minchin back onto the show today after she was off air for several weeks.
Louise revealed she had broken her foot back in 2019 and had needed an operation to try and correct the damage.
She hadn't realised the extent of the damage after avidly running last year, until she paid a visit to the doctor.
Dan shared his joy as he and weather presenter Carol Kirkwood welcomed Louise back to the show.
He said: "It’s nice to have you back by the way.
"I’ve only been asked 3000 times a day where you are. It’s nice that you’ve actually come back."
Louise replied: "I’ve had a foot operation to fix it, it is now on the mend. I’m still on crutches but I’m getting stronger every day."
BBC Breakfast continues tomorrow at 6am on BBC.