TFL decided not to renew the taxi app's licence from the end of the month, risking the jobs of 40,000 drivers.
TfL said Uber was "not fit and proper" to operate in the capital and that it took the decision on the grounds of "public safety and security implications".
However Field said the ban was warranted not only for safety concerns, but also for unfair working practices that have become common in the gig economy.
Field said he wrote reports about the gig economy citing Uber and asked Sadiq Khan "to take the very action that he's taken".
The MP for Birkenhead said there's concern for large numbers of Uber workers, many who have been "continuously trapped into working for Uber because of arrangements to buy particular cars".
He also accused Uber of using their position to push wages below the minimum wage and describing the status of Uber workers in a way in which the company doesn't pay national insurance contributions.
Field added that it was a delicate situation, but the firm warrants proper scrutiny.
"A lot depends on this," he said.
"A lot for travelling public in London, a lot for the safety of the people in London, a lot for the decent wage for those Uber workers.
"But this will ricochet throughout the country as well. I think it will be a rough period."
Uber's signalled it's willing to compromise. The taxi app's general manager in the city has told The Sunday Times they want to sit down with authorities to get it right.
The paper said concessions could include sick pay for drivers and a limit on hours they work to improve road safety.
More than half a million people have signed a Change.org petition asking for the decision to be reversed, making it the fastest growing petition on the UK website this year.
