Norway head to the Atatürk Olympic Stadium in Istanbul next Friday, 8 October, to face Turkey before hosting Montenegro at the Ullevaal Stadion, Oslo, three days later. Both games kick-off at 7.45pm UK time.
Kristoffer and his teammates are currently second in Group G with four games remaining. They are level on points with table-toppers Netherlands and two clear of third-placed Turkey. The top side in each group will book their spot in Qatar automatically with the Play-Offs awaiting for the runners-up.
The summer signing has started four of Norway's six 2022 FIFA World Cup Qualifiers, taking his tally of caps to 25 for his nation.
Saturday's thrilling 3-3 draw against Liverpool was the 23-year-old's sixth Premier League appearance since joining from Celtic in the summer. Kristoffer also featured off the bench against Forest Green Rovers in our Carabao Cup Second Round win.