Now in his second season with Marseille, Greenwood is thriving, having scored 42 goals in 64 appearances.
However, his move from Manchester United was greeted with protest and controversy after previous assault charges in England which were eventually dropped.
Speaking in an interview with The Telegraph, Longoria said: “For me, it’s correct to speak openly about it.
“Creating taboos in life is never positive. For us it was a massive market opportunity from a sporting perspective where we analysed, very carefully, what really happened.
“In that case, having done due diligence and having all the information – and this is the first time I speak about this – with all the information I called my mother. And I said ‘what do you think, knowing all the situation?’
“And my mother, who used to work in the prison system in Spain, having a very innovative prison system model in Spain – she was recognised with the medal of the state – so I ask her, having all this information, ‘what would you do in my position?’ And she said to me ‘do it’. With all the information.
“It was important because I wanted someone who doesn’t have the incentive of the sport, because the talent is there, that her only incentive is the good of her son. As a man, not as a president. And, for me, it was very important that she said to me, knowing all of this, ‘do it’.”
On Greenwood's future, Longoria continued: "We are happy.
“He’s performing and the numbers, the talent is there. At the same time, it’s also if we are on the same page, it’s also a moment to analyse, as well the financial situation and ecosystem of French football, knowing all the difficulties.
“But I think if we are all aligned on Mason he can still have a future here. I think that it can be as well for him necessary because we are seeing that Mason this season is not the Mason of last season. I expect that he’s continuing to grow up and I would like to help him as well, you know, being better each day.”