Kate Hoey has refused to rule out accepting a job from newly-elected Conservative leader Mr Johnson, if he were to ask.
The Labour MP announced earlier this month that she would be stepping down at the next general election, but in an interview with talkRADIO today, hinted that she was keeping her options open.
Theresa May's former communications chief, Katie Perrior, asked Ms Hoey: "Is there a job for you at Number 10 Kate? Boris loves you and the Labour Party doesn't so much."
In response, Ms Hoey said: "I'm still a Labour MP, but I find more and more Labour is moving away from me, rather than me moving away from Labour."
When pressed further, she refused to rule out taking up a job under the new Prime Minister, but added: "I don't think he's going to [offer]."
The politician was full of praise for Mr Johnson, having worked with him during his time as Mayor of London.
"It was very clear that Boris had a grasp of everything, but knew how to delegate and delegated well," she explained.
"I think people felt that they were trusted - there was a great atmosphere."
Since Ms Hoey's resignation announcement on July 8, a number of people have speculated whether the staunch Brexiteer will join Nigel Farage's Brexit Party.
She was elected to the Vauxhall seat in 1989, and served as a junior minister in the Home Office and Department of National Heritage during her time in Parliament.