The Anfield superstar took the dig after he was criticised by Young after Liverpool's defeat on Saturday.
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.
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, posting to twitter immediately after United's defeat to Sevilla: "The UCL draw can't come soon enough."