In 2016, he moved to Canada, joining Aurora United FC in League1 Ontario, where he scored 19 goals in 19 league games, as well as netting an additional two goals in the league cup.[4] His coach at Aurora, Jim Brennan told him that "he’s too good for this league, and that he needs to go back to Europe."[4]
He returned to Sweden and joined Assyriska IK in the third tier in 2018, where he scored 30 goals.[5]
On 3 December 2018 Adjei signed a two-year contract with Canadian Premier League side York9, reuniting with his former manager at Aurora, Jim Brennan,[6] and becoming the first foreign signing in league history.[7] He made his debut for York9 in their inaugural match against Forge FC on April 27, 2019.[8] He scored his first goal for the club in their following game on May 4, 2019, against Cavalry FC in a 2-1 defeat.[9] In December, he re-signed with the club for the 2020 season.[10] However, on 1 February 2020, Adjei agreed to the mutual termination of his contract.[11] In 2020, he said that "It (Canadian soccer) is much tougher, and you are left a little more on the field, you have to manage yourself a little more. You do not have the same support".[12]
He then returned to his former club, Assyriska IK, in the Swedish third tier, where he scored 25 goals in 27 appearances.[13]
On 5 December 2022, Ajdei signed a one-year deal with Superettan side AFC Eskilstuna.[14] On 22 June 2023, the club announced that Ajdei's contract had been terminated by mutual agreement.[15]