Mohammed Nasiru scored the last goal in Haecken's 3-0 win over Sarpsborg 08 in a club friendly on Saturday.
The Ghana international was on target in the 76th minute to add to first-half goals from Viktor Lundberg and Daleho Irandust.
Nasiru is warming up for the start of the season with the Swedish side.
Last season, the 23-year-old scored eight goals in 25 league appearances.