The Dons will meet Spanish La Liga side Real Sociedad if they overcome Groningen next week.
Aberdeen drew 0-0 with the Dutch outfit at Pittodrie and face the second leg of their second qualifying round tie on Thursday.
The Reds have already overcome Latvian opponents Daugava Riga 8-0 in the first qualifying round.
The third qualifying round ties are due to be played on Thursday 31st July and Thursday 7th August.