The former Red Devils defender posted on Facebook and Twitter that the Portuguese has been confirmed as the famous club's next boss.
While the former Chelsea boss is expected to be unveiled on Friday, no official statement has been made by United, but Ferdinand was quick to post his thoughts on the impending appointment on social media.
Ferdinand wrote: “Congratulations to Jose on being announced manager of the biggest club in the world!
“This is Jose Mourinho's most exciting & most challenging job yet.
“The first thing he needs to do is install 'winning mentality' back into the club.
“He will be desperate to silence the media who have been writing and saying negative things about him (he will have stored it all being the competitor he is) and will be as focused as ever.
“Mourinho's huge personality is made for this great club, it's what he has been waiting for. Wishing him all the best!"
Check out his posts below:
Jose.. Signed.. Sealed.. Delivered! #Mourinho announced @ManUtd manager!! My thoughts - https://t.co/UYNsLR3W6Hpic.twitter.com/MAVbSgKuqs
— Rio Ferdinand (@rioferdy5) May 26, 2016