Potter is insisting the 26-year-old's quality remains intact and that the problems stem from circumstance rather than character.
Isak arrived at Anfield last September having forced his way out of Newcastle United in a British club record deal, but his first campaign on Merseyside was defined almost entirely by injury. He reported for pre-season unfit after training alone during a prolonged transfer saga, suffered a groin problem in October, broke his fibula in a collision with Tottenham Hotspur's Micky van de Ven in December while in the act of scoring, and then sustained further groin issues that closed out his season. He played 22 times in all competitions and scored four goals.
Potter, who replaced Jon Dahl Tomasson as Sweden manager earlier this year, called up Isak for the World Cup squad despite the difficult campaign and watched him score from the bench in a 3-1 friendly defeat against Norway before starting 63 minutes of a 2-2 draw with Greece. The signs of recovery were sufficient.
"Alex has had a difficult spell at Liverpool because of injury. But the player doesn't change. His quality doesn't change. He's still a top, top, top player."
He placed the wider situation in the context of a club in transition — Liverpool dismissed Arne Slot last Saturday after a second season in which the Dutch head coach lost 20 matches across all competitions before Andoni Iraola was confirmed as his successor on a two-year deal.
"It's just how they interact as a team together. And if you make a lot of changes, it can take a bit of time.
"Unfortunately, sometimes, at the big clubs, the big change means big pressure and expectation — and as soon as that gap starts to become too big, you can have problems."
Potter also addressed the human dimension of Isak's experience, offering what amounted to a character reference.
"I know him. He's a great, great lad, wants to play football and wants to help his team. Sometimes everybody's career can go up and down, but the quality of the person and the quality of the player is undeniable from our perspective."
Sweden face Tunisia on June 15, the Netherlands on June 20 and Japan on June 25 in Group F. Whether Isak can sustain the fitness levels his country will need is one of the tournament's more watched personal stories.