All three SPFL clubs drew the first legs of their Europa League second-round qualifiers on Thursday night.
St Johnstone earned an impressive 1-1 draw against FC Luzern in Switzerland, going ahead through Steven MacLean early in the second half before Marco Schneuwly levelled in 69 minutes.
A crowd of 16,523 saw Aberdeen and FC Groningen play out a 0-0 stalemate at Pittodrie in a game of few clear-cut chances.
Josh Law scored a debut double at Fir Park and Motherwell looked in command against Stjarnan but the Icelandic side hit back with a pair of penalties from Olafur Karl Finsen, the second in stoppage time, as it ended 2-2.
The second legs all take place next Thursday, July 24.