Shaw was this week called up to the senior national team for the first time, and is in line to make his bow on Wednesday, when Denmark visit Wembley.
"I think he's fully prepared mentally to face the situation," said the Saints manager.
"I think he's a player that's grown a lot in the year-and-a-bit that we've been here.
"He's matured a lot, he's grown a lot in that time, and I think it's going to be a very positive experience for him.
"I think it's going to help him grow as well in the future, this chance with the English national side, and it's a great chance also that he's going to be playing with the best that this country has to offer and he's also going to be managed under a great manager such as Roy Hodgson, so, overall, it's going to be a massive positive thing for him."
For breaking stories and all the great banter like us on Facebook: facebook.com/tribalfootball