The France international left-back has been out of action for months after he was suspended for fly-kicking a Marseille supporter.
He was released from his deal and is now embarking on a shock return to the Premier League at the age of 36.
Evra has worked with West Ham boss David Moyes once before, during the 2013/14 season at Manchester United which preceded his Old Trafford exit.
Evra had a tough start at Old Trafford but quickly won supporters over and became a real fan favourite.
At United he won five Premier League titles, one Champions League, and three League Cups, before joining Juventus where he clinched two Serie A titles and was a Champions League runner-up.
The left-back is certainly in the final stages of his career and is no stranger to controversy.
But it says a lot about Evra's quality that some Manchester United fans have expressed their wish that he was heading back to Old Trafford on a short term deal, and that should encourage West Ham supporters about the shock move.
Here is a look at how Red Devils fans reacted to Evra's switch to West Ham...
Evra to West Ham? Why not just sign the guy up back at #MUFC. The cover would be worth it. He's a free agent..— Uzair Ahmed. (@uzairahmed07) February 7, 2018
I would honestly just get Evra, pay his wages and all and not even play a game. The morale boost he would bring to the squad but be worth the wages. Come on Ed! #MUFC— MUFC_Source_ (@MUFC_Source_) February 6, 2018