Although he failed to qualify for the Chess World Cup 2019 through European Championship placement, Alekseenko was chosen as a wildcard nominee by the organiser of the tournament. He defeated Nguyễn Ngọc Trường Sơn and Johan-Sebastian Christiansen in rounds one and two, then eliminated the 17th-seed Pentala Harikrishna in the third round. He faced the 1st-seed Ding Liren in the fourth round. Alekseenko drew both of the classical games but lost in the rapid tiebreaks.