A terrific cross from highly rated youngster Tahith Chong helped get United back on level terms - the teasing delivery picking out Herrera who hit the post before Mata fired home the rebound in the 78th minute.
"I would like to be in Los Angeles now and I am in San Jose, you can not do whatever you want in life", said Mourinho, who is also linked with a move for Leicester and England centre-half Harry Maguire.
There is plenty of Manchester United-related gossip doing the rounds in the papers with the Red Devils linked with a whole host of star names.
The Red Devils are likely to miss most squad members for the encounter, with players like Paul Pogba, Marcus Rashford and Romelu Lukaku all enjoying an extended vacation after playing in the final weekend of the Mundial in Russian Federation. "He needed this and he made a good effort, a good physical effort, which is important for him in this moment".
Jose Mourinho was desperate for Sanchez to play, despite his delayed arrival, with so many of his first-team regulars absent ahead of United's Premier League opener against Leicester City on August 10 after the 2018 FIFA World Cup in Russian Federation. We are not a team.
Neil Armstrong's personal collection of moon landing artefacts up for sale
The auctions will be held on November 1-2 this year, as well as in May and November of 2019, which marks the 50th anniversary of the Apollo 11 mission.
After a 1-1 draw with Club America in our first game of pre-season, Mourinho had expressed worry about the absence of Sanchez and over players, though it seems latest news will cheer him up.
"One more training session", Mourinho told MUTV.
"Good for Alexis", he said.
Manchester United defender Luke Shaw makes his intentions for the season clear, hoping to take advantage of his opportunity during the ICC.
Club America, who start their season next week, looked more energetic second half and dominated the early stages.