The Spaniard came to the aid yesterday to shoot the game against Bournemouth.
Manchester United were early in the 11th minute in the Premier League after Callum Wilson's strike at Vitality Stadium.
In-form Anthony Martial equalized before the break.
In the second phase, however, United had much more control, Herrera was after 56 minutes in action.
The 29-year-old replaced Fred in the summer for 52 million pounds and came on more than one occasion just before a goal.
However, it was Herrera's influence on his team-mates that was crucial as he allowed Paul Pogba to contribute more to the attack because of his disciplined positioning.
Pogba eventually set out to found Marcus Rashford as a United stoppers in injury time, which justified Mourinho's tactical change.
Former midfielder Scholes believes Herrera could be a real solution for the forward looking team.
"He seemed to make sure to stabilize the ship a bit"
"I think Herrera made a big difference to the team," Scholes told BT Sport.
"He seemed to make sure to stabilize the ship a bit, and Pogba could do what he can.
"If Pogba is in the midfield, which is expected to discipline him, he does not really like the responsibility.
"Fred, I do not think so.
"Well, Herrera has a big change in the game."
United faces a crucial week, possibly in their season, with incredibly hard trips to Juventus and Manchester City.
It remains to be seen if Herrera will participate in the clashes between the Champions League and the Premier League.
But he has undoubtedly left Mourinho in doubt for the match in Turin on Wednesday and the derby in Etihad next Sunday before the international break.
The long-term future of Herrera at Old Trafford is still undecided, as its current contract expires in June.