TfL is currently reviewing its ad account as part of a statutory review, which includes work for the Greater London Authority and its services such as the London Fire Brigade, the Met Police and the London Legacy Development Corporation.
The review was open to agencies outside of the government roster.
Campaign revealed there were ten agencies on the longlist last month: FCB Inferno, Abbott Mead Vickers BBDO, Bartle Bogle Hegarty, Engine, Leo Burnett, M&C Saatchi, Ogilvy & Mather, Rainey Kelly Campbell Roalfe/Y&R, DLKW Lowe and VCCP.
Earlier this month TfL released a hard-hitting road safety campaign, created by M&C Saatchi, reminding road users of the consequences of just one bad decision.
In April M&C Saatchi created a campaign for TfL to raise awareness of sexual harassment on the Tube. The ad showed a woman being groped by a man and asked the viewer whether they would report the incident if they saw it.
TfL is also reviewing its media business for which MEC is the incumbent. It is the first time the reviews are being run simultaneously. The process is being handled by AAR.
A spokeswoman for M&C Saatchi said: "We have worked with the team at Transport for London for the last 15 years and stood side-by-side with them through the 7/7 bombings, the London Olympics, the launch of Oyster and the Boris bike.
"We are very proud of our long list of creative and effectiveness awards. We wish them luck in the future."