Since Ferguson left his post, United have had four managers: David Moyes, Ryan Giggs, Louis van Gaal and now Jose Mourinho.
But I'm very happy to be with this club.
When asked whether he will celebrate if he scores on his Premier League debut for the Hammers against United on Sunday (4pm), he added: "Right now I can't imagine the emotions I would have in that moment".More news: MS could be home to new auto plant
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He said: "I have no regrets, I never have any regrets in my life".
Hernandez is one of a number of new arrivals at the London Stadium as Slaven Bilic looks to build a squad capable of improving on the 11th-placed finish last season.
Hernandez is a big fan of Hart and believes the new crop can help West Ham qualify for continental competition.
"Joe Hart is a great lad, a great professional".
"It's hard for us to start the season already with three away games, so we need to see how we start the season and from there we can start to know where we are", Ayew said, as reported by his club's official website. He always gives 100 per cent on the training ground.