Striker Alexander Isak will get "stronger and stronger" and is smiling again, Sweden coach Graham Potter said Friday in a World Cup warning to defences. He struggled for fitness and form, but showed some of his brilliant best as Sweden opened their World Cup with a 5-1 thrashing of Tunisia.
Source: [Yahoo Sports](https://sports.yahoo.com/articles/world-cup-warning-sweden-star-222208427.html)