Tuesday's and Wednesday's training sessions at the Parador de El Saler south of Valencia were closed to media and curious tourists.
Coach Potter does not want the Ukrainian national team staff to receive information about the Swedish starting eleven, tactical moves or ideas for set pieces. Earlier this week, he did not even want to say whether he is sticking to a four-back line.
Speculation has been fueled about how the national team will approach Thursday night's playoff semi-final at Estadi Ciutat de Valencia (kick-off 8:45 p.m.).
The players do as Potter says: they keep quiet.
"That's clear," says Lagerbielke.
Currently playing as a right back
The centre-back from Braga is seen as a possible right-back in a Swedish 4-4-2 system, with Victor Nilsson Lindelöf and Isak Hien behind him. It's a position he is not entirely unfamiliar with.
"In my first A-team season in Sollentuna in Division 1, I was a right-back. I think that no matter what position you play, many players in the national team have a handle on it."
Potter can use several options in midfield. Jesper Karlström and Hugo Larsson are in contention as defensive midfielders, with players like Anthony Elanga, Yasin Ayari and Daniel Svensson competing for other spots. Benjamin Nygren is tipped as a withdrawn striker behind Viktor Gyökeres.
Against Switzerland and Slovenia in November, Mattias Svanberg was tested in the roles of both defensive midfielder and withdrawn striker.
Williot Swedberg backs Carl Starfelt as a centre-back.
"I think he is in the top five, if not top three, of the centre-backs in La Liga this season. I say that not only because he is my friend but because he has been dominant in the defensive game. In the duel game he is as strong as can be; he reads the game well."
Practising set pieces
The national team has been practising set pieces during the closed training sessions.
"It's a very important part of football, as it has developed in recent years. I think a third of all goals are scored from set pieces," says Gustaf Lagerbielke.
Tottenham's Andreas Georgson is also the national team's set-piece coach.
"You can see that he is very talented, has a lot of experience and that he has been to many top clubs in England," says Lagerbielke.
