The goalkeeper failed to make any appearances during his year loan with Tottenham, but he may still hope to convince Pochettino this summer in Poland.
Tottenham's Pau Lopez and Son Heung-min during training
His side kick off the tournament against Macedonia on Saturday, and the Espanyol man is keen to showcase his qualities.
"I’m very happy, I’ve been playing in the last two years to qualify and for me it’s a pleasure to be with the squad, to be with my mates and I hope we can have a good performance," Lopez told the Tottenham website.
"We're playing with the best European players in our age group so I think it’s a very good tournament to show your level and to get experience.
"If we can play how we played the last two games (in the play-off qualification tie against Austria) maybe we will have a chance to fight to arrive in the final and to win."
The 22-year-old endured a strange season on loan at White Hart Lane - as the club's third choice keeper - failing to feature in any first team matches.
Since the season ended there have been a mixture of reports about his future, and despite suggestions he was about to secure a cut price move, the latest from AS Sport has him returning to Spain, with Tottenham snubbing the goalkeeper's asking price.
But with the Spanish Under-21 side one of the favourites for the tournament, Lopez will know that any impressive performances could be his last chance of convincing Mauricio Pochettino to sign off on a move.
Pau Lopez in action for Espanyol
Lopez is one of three promising goalkeepers in the Spanish squad, alongside Celta Vigo's Ruben Blanco and Athletic Bilbao's Kepa Arrizabalaga.
Arrizabalaga is the most capped man in the group, and has impressed for his club side in La Liga this season. But it is Lopez who has the most top flight appearances to his name, despite his struggles this season.
He has featured in 38 La Liga games in his career, more than the other two who haven't registered more than 23 appearances.
It remains to be seen who head coach Albert Celades will select as his stopper, but Lopez will be hoping it is he who gets the chance to impress.
Celta Vigo's goalkeeper Ruben Blanco