The 36-year-old has been a free agent since November, when his last club Marseille terminated his contract after he was involved in an *clears throat* altercation with a supporter.
But the French footballer can still play in Premier League matches. City's right-winger that day Trevor Sinclair had a field day and Evra was hauled off at half-time.
Evra, who won the Premier League five times with United and the Serie A title twice with Juventus, could make his Hammers debut against Watford on Saturday.
West Ham fans, what are your thoughts on the signing?
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Evra was widely-regarded as one of the fittest at Old Trafford during his eight-year stint, and has been in Dubai training on a daily basis since he left Marseille in mid-November.
For now this looks like a good move for West Ham, one which will strengthen a shaky defence and hopefully improve squad morale.
"They might be 26 or 27, they might be 23, but they won't be 32".
Evra, 36, played in the Premier League between 2006 and 2014, wearing the Manchester United jersey.
James Collins and Jose Fonte are both 34, while first-choice right-back Pablo Zabaleta turned 33 last month.
West Ham is short of cover at left back because Arthur Masuaku is serving a six-game ban for spitting at an opponent. The main thing was for me to join West Ham and to help my teammates to win as many games as we can.