The Danish striker left Forest after just 17 games for the club.
Nottingham Forest's Nicklas Bendtner
The Dane scored just twice in 17 games after joining in September, and he was recently moved on, joining Rosenborg in Norway on a three-year deal on a free transfer.
His time at Forest was hampered by fitness woes but he soon just found himself out of contention based on his form for the club.
One man however who is aghast that Forest did not get the best out of the player is his new head coach. Rosenborg boss Kare Ingebrigtsen told the Danish newspaper BT this week that he was shocked Forest did not play him more:
“What surprises me is that the club that he comes from hasn’t used him. It’s surprising.
“For he is a very, very good player.”
Bendtner has had a tumultuous career to date, often making the headlines more for his actions off the pitch rather than on it.
He made his debut for his new club recently, coming off the bench in a 2-0 Norwegian Super Cup win against SK Brann.
He will be hoping that is the first of many medals he picks up at the Norwegian giants.