Although the draw for the playoff round was made on Aug. 2, it was on Aug. 9 that Viborg advanced by completing a 5-1 aggregate victory over Faeroese club B36 Torshavn. Jatta scored in the 2-1 second-leg win.
Viborg is playing in European competition for the first time in 22 years. West Ham reached the Europa League semifinals last season.
Viborg will host the Premier League club in the second leg next week. The winner advances to the group stage.