The pair were outstanding in victory over Tottenham last night.
Giggs told manutd.com: "Yes, we've seen the ability that they've had over the years. Like you say, they've grown up in the youth team. You always keep an eye on the youth players with special qualities.
"Daniel and Thomas are players who've got great ability and now they've grown up, both physically and mentally because they've gone away to other clubs and done well, now they want to come back and stay at the club. I'm sure they will because they got off to such a good start this season and they've got so much talent. But they still want to improve and to learn, and they will."