 Complete the following phrase:  In May 2012, Krafth was called up to the Sweden U21 squad for the first time. Krafth became the fifth youngest person ever to play in the Sweden U21 team, being 17 years and 309 days old when he played in Sweden U21s match against Malta on 6 June 2012. Krafth then kept three consecutive clean sheets between 5 June 2014 and 5 September 2014 against Iceland U21, Slovakia U21 and Greece U21, all of them were wins. However during a 22 draw against Denmark U21 on 11 June 2015, he suffered a back injury that kept saw him miss the 