Jan Vennegor of Hesselink says qualifying for the Champions League group stage is just the beginning for Celtic this season.
"Qualifying for the group stage was a brilliant achievement, but the whole season is about so much more.
"The Spartak game will be viewed as one of the most important. But hopefully it will be overtaken by others.
"Let's hope when we look back on this season in years to come we are not only talking about that match."