"The players need to rest and recover after more than 12 months of competition", said Pochettino. "Of course Son is a very important player for us, but I can not change the reality even if it is hurting us".
Fernando Llorente scored twice in the win, prompting speculation that the former Spain global, who struggled to make an impact last season, could be on his way out of the club before the start of the new season.
Roma head coach Eusebio Di Francesco said: "We had a good start to the game, although I didn't like how we defended in the second part of the first half, we were not compact enough or organised enough on the pitch". Some teams with more problems than others, but I think it's to translate the confidence and trust we have in the squad.
"Be sure that we are going to do some movement but like always, we're working hard [but will make] no rash decisions. No rash decisions. I'm not anxious".More news: Epic Games Opens the Fortnite Beta on Android to More Devices
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Son's new deal is one of the few tied up by Spurs this summer, along with a contract extension for Erik Lamela, while rumours continue to swirl over possible moves for the likes of Wilfried Zaha and Jack Grealish.
Despite this, Pochettino seems utterly at ease with everything, with quotes that suggest that the retention of his key players is just as important as the arrival of new ones. He is going to transfer out seven players including striker Vincent Janssen and Fernando Llorente for a decent amount of money. "We miss a lot of players due to the World Cup".
Tottenham fly to Los Angeles on Sunday and face Roma, Barcelona and AC Milan in the next nine days. Tottenham are generally busy late on in the summer window and, if Pochettino is to be believed, it sounds like they will be again. They have always been able to get the players for their team according to their need and it will be no surprise if they do the same in this transfer window.