On 24 July 2015, Vaikla signed a year-and-a-half contract with Swedish club IFK Norrköping. He was a part of the IFK Norrköping squad that won both the 2015 Allsvenskan and the 2015 Svenska Supercupen, however only appearing as an unused substitute. Vaikla made his debut for the club on 20 February 2016, a day after his 19th birthday, keeping a clean sheet in a 4–0 victory over Östersunds FK in the 2015–16 Svenska Cupen. On April 22, Vaikla made his debut in the Allsvenskan, replacing the injured David Mitov Nilsson in the 19th minute of a 1–2 loss to Falkenbergs FF. He made 13 league appearances in the 2016 season.