And, in an interview with the French magazine So Foot, Herrera has revealed how the relentless emphasis on football at PSG proved something of a culture shock from his time at United.
'I cannot talk about what was happening in previous seasons because I was not there, but since I'm here, what I see is that I'm in aclub that think only and exclusively about football,' Herrera said.
'And I say it sincerely because sometimes, seen from the outside, PSG can have a glamorous side that can irritate some. But here we sweat, we train, we work!
'When I arrive at the training centre, the physios, podiatrist and physical trainer are already at work... Football, football, football.'
As a follow-up question, Herrera was asked whether this wasn't necessarily the case at United.
He replied: 'I was happy at that incredible club. I am very grateful to the supporters.
'Frankly, I was immensely happy in Manchester, but at the club, there were times when I felt that football was not considered the most important thing.'
His comments could be interpreted as a swipe at United executive vice-chairman Ed Woodward and their relentless pursuit of commercial gain at the expense of winning on the pitch.
United are one of the world's most wealthy clubs but have won just three major trophies since the retirement of Sir Alex Ferguson back in 2013.
