They have Vanderbilt out there now as the sole big man next to LeBron effectively playing center while DEN rest Jokic. So Vanderbilt is matched up with Jeff Green who is playing center for DEN. That looks the best matchup for them.
Even then, DEN has a skill advantage with J Green over Vanderbilt. They should be able to exploit that.
Vanderbilt will have to find a different way to outplay. Jeff Green is a poor rebounder for his size. Vanderbilt is a good rebounder & a great athlete. He has to attack J Green on the boards particularly the offensive glass and come up with extra possessions for his team. That looks the only way he can help his team and avoid being outplayed by Uncle Jeff.