The Egyptian was seeking revenge after the Red Devils ace had a dig at him following Liverpool's 2-1 defeat at Old Trafford.
Salah cleverly decided to post the tweet after Mourinho's side were booted out of the Champions League by Sevilla.
The Reds missed out on the chance of progressing to the last eight of the competition after being beaten 2-1.
And just to make things a little worse, Salah tweeted: "The UCL draw can't come soon enough."
The Anfield superstar took the dig after he was criticised for his performance against Mourinho's men.
And Young, 32, went out of his way to criticise the Egyptian on Instagram last weekend.
The United star posted a picture of himself on his Instagram story with his arms out.
A MOURINHO DISASTERCLASS Fuming Man Utd fans call for Jose to be axed after Sevilla shocker
He then added the caption: "Stop asking me! He's not in my pocket, I swear he's not."
But Salah had the last laugh after Jurgen Klopp's side booked their spot in the last eight remarkable 5-0 victory against Porto.
And it's not just Salah who has decided to slate the Reds after their shocking display on Tuesday night.
United fans have called for Mourinho to be axed after an extremely dull display at Old Trafford.
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