Jesus is now one of the biggest talents across town with Manchester City while French wonder-kid Mbappe joined PSG for €180 million during the summer.
"I watched Mbappe for a year. I watched Mbappe for a year", he told The Times. "I was watching them with the scout and it was a no-brainer", Giggs told The Times. "It would have been £5 million or something - get them, loan them out - and that's where the recruitment could have been better".
Giggs moved on from United following Mourinho's appointment and, despite disagreement on recruitment and over the sales of players such as Danny Welbeck, Jonny Evans and Javier Hernandez, he insists the time spend under Van Gaal proved an invaluable education. They had fallen down the pecking order, so do they go for someone who - and it winds me up saying this - hasn't got experience as a manager or do they go for a victor?
United did not make a formal bid to sign Jesus, who joined City from Brazilian side Palmeiras in a £27 million deal a year ago.
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And the most decorated player in United's history also thinks some of the players they let go should never have been allowed to leave the club.
Towards the end of van Gaal's erratic tenure there were rumours of a falling out with Giggs, and the Welshman admitted that they had a number of arguments over transfer policy.
"They went for a victor, in Jose, a win-at-all-costs type of manager".
United could have snatched the points through a clear chance Romelu Lukaku missed before half-time, but the limited attacking intent shown marked a stark contrast to Pep Guardiola's swashbuckling Manchester City. "Probably not, but United were in a situation of 'How quickly can we get back to the top?'" I knew the players. "That was a fantastic experience". It's not where I've worked in my career. "I've spent my whole life in the Premier League - not just as a player but as a player-coach and assistant manager".
"If they had called [and said],'Listen, we've gone with someone more experienced' - then fine".