"I think I played deeper. I think a while ago now he got moved behind Harry Kane because simply his runs are too good.
"His ability around the box and his knack of getting in the right place was too good and they link so well together.
"This season he's played up there quite high, then he's dropped back into midfield. He hasn't found that consistency of what he found for the second half of last season.
"In terms of young players in world football, his runs and timing and obviously his quality of finishing, is up there with anybody.
"I see those angled runs I tried to make. I always tried to make runs behind defenders ... because the defenders were sometimes marking and don't see that angled run behind."
Alli opened the scoring in the 27th minute when he converted Kieran Trippier's cross from close range, and he doubled the lead in the second half courtesy of a deflection off Sergio Ramos, following an impressive run from the midfielder.
He should have had a hat-trick when he sent a free header wide, but Christian Eriksen made sure of the result before Cristiano Ronaldo pulled back a consolation late on.
Squawka Football shared Alli's numbers:
Meanwhile, as broadcaster Jake Humphrey noted, Alli has come a long way since making his debut as a 16-year-old:
Spurs boss Mauricio Pochettino praised him, too. Per Jack Rosser of the Evening Standard, the manager said the match was a "great opportunity for him to show his quality" and believes Alli is "getting better and better every day."
It was Alli's first UEFA Champions League appearance of the season after sitting out the opening three games through suspension, and he was delighted to finally be involved, per Spurs' official Twitter feed:
The youngster perhaps has not been at his best so far this campaign, but it's easy to forget he's still only 21 given the key role he already plays for Tottenham.
Wednesday's performance offered a timely reminder not only of the bright future Alli has ahead of him—and he has plenty of time to develop his game even further—but also the heights he's already capable of achieving.