The 21-year-old has spent the majority of the 2013-14 campaign on the sidelines due to a knee injury after joining the Premier League outfit from Vitesse last summer.
Nevertheless, Van Ginkel has stressed that the former Real Madrid boss always supported him as he was recovering from his fitness woes.
"There are some similarities between Mourinho and Van Gaal," the midfielder told Goal.
"A lot of people want to know how Mourinho's like. He's incredibly fanatical and always wants to win. You occasionally see him do something crazy on the sidelines, but he's a very warm person.
"He's always open to you as a person, yet he can get very angry as well.
"He always kept on supporting me during my recovery. I definitely did not get the feeling that he wasn't interested in me. We saw each other on an almost daily basis and regularly spoke.
"I decided to recover in London, so I would stay close to the team and the manager. I appeared in the dressing room as well for home games and always had a certain bond with the team."
Van Ginkel was recently called up for Netherlands' pre-World Cup training camp and the energetic midfielder is hopeful of making it to Brazil this summer.
"It will be a dream come true if I make it to the World Cup. I hardly played this season due to my knee injury, but I'm fully fit now.
"I might not have the same match rhythm as the other players, but being here at this training camp makes me want more."
Netherlands meet Spain, Chile and Australia in Group B at the 2014 World Cup.