Mexico international left Old Trafford after struggling to work his way into Louis van Gaal’s plans, but has continued to shine in the Bundesliga with Bayer Leverkusen.
United, meanwhile, are now heavily reliant on the form of 35-year-old front-man Zlatan Ibrahimovic, who has let some big chances go begging throughout much of this season.
Mourinho believes his side are just lacking ‘killers’ in front of goal after creating plenty of chances this term, and pointed to Hernandez as a player who could have thrived in this team.
‘We have some players that are not really players in love with the goal,’ the Portuguese explained.
‘They are good players, they are creative players, they can create but, naturally, they are not the kind of guy that is a killer.
‘I give a simple example. In the way we play at Old Trafford, in the way we dominate opponents, in the way we play in the box, I think Chicharito (Hernandez) would have 20 goals easy.
‘Even coming from the bench for the last 10 or 20 minutes, he would have 20 goals.
‘He is the guy that, naturally, the ball comes here, rebounds here, rebounds there – boom, goal. The goalkeeper saves, he goes there – boom, goal. The cross is coming, he anticipates the first-post header, goal.’