The winger has featured six times already this term, including three substitute appearances in the Premier League and his sole start in the Capital One Cup was capped by a fantastic goal in our 3-0 win at Carlisle.
"From the first moment this season, he’s tried to fight for a place in the team," Freund told the Spurs website.
"Can you imagine, as 21 year-old, you have in front of you Gareth Bale, one of the best wingers around?
"Andros keeps going, he trains well, he’s always there if you need him, always strong, creates something, he played fantastic at Carlisle and scored as well.
"Now he’s with the Under-21s and that’s great for him to be involved in two big games against Serbia.
"It’s fantastic to work with Andros because he likes to improve and I think over the next few years, he’ll be one of the biggest talents in England."