"I really like the Matic signing", he said in an exclusive BT Sport Facebook Live ahead of Tuesday's UEFA Super Cup.
The Blues sold the Sebian global in a £40million deal, despite the midfielder playing a pivotal role in the Blues' Premier League title win last season.
"That's the one that surprised me".
"At 29, I can understand why Chelsea sold him but it's still a good signing for Man United as there are not many of those players about".
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Speaking to Betfair, Le Saux said: "Antonio Conte's comments about the "crazy transfer market" this summer highlight the lack of depth in the Chelsea squad and I don't see them as obvious champions, particularly with the extra challenge of European football and the fact it's hugely hard to defend a Premier League title. What he brings that Michael doesn't bring is that aggression, which is to say he gets to the ball, he tackles, he allows other people to play".
It's an argument that Scholes believes has plenty of merit.
'But sometimes I think you must accept this insane transfer market.
"Him and [N'Golo] Kante were magnificent".
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"And I'm hoping he'll do that with United - freedom for [Paul] Pogba, [Anthony] Martial, [Jesse] Lingard and [Henrikh] Mkhitaryan - these players really need to step up this year I think".
From United's perspective, Matic's arrival also carries the additional bonus of weakening one of their main rivals for the title this term.
Chelsea have signed Tiemoue Bakayoko as a replacement, although the France worldwide will miss the start of the season through injury.
Conte, who was rumoured to be at odds with the Chelsea board regarding transfer strategy earlier this summer, has publicly claimed that Matic will be a "great loss" at Stamford Bridge.
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