Following his move to Norwegian champions Rosenborg, Nicklas Bendtner said the managerial change at Forest made him consider his move away.
The Danish striker joined the back-to-back Norwegian title winners for an undisclosed fee on Monday night (March 6).
He linked up with his new teammates yesterday (Wednesday March 8) at their training camp in Marbella, Spain.
Speaking at his first press conference as a Rosenborg player in Marbella, Bendtner said: “I had not considered a move away from Forest because I felt I still had things I could accomplish there.
“But things happened with the managerial change so when interest came from Rosenborg, I was looking at my options.
“I felt Nottingham was a good opportunity and I think had I still been there, it still would have been a good option but that is no longer the scenario.”
Bendtner’s last start for Forest was in the 2-1 FA Cup defeat to Wigan Athletic when Montanier was still at the helm.
However he has not been in the match day squad since the end of January.
He explained at his unveiling that he did not see a move to Rosenborg as a step back and said: “As a footballer, the most important thing is being somewhere where you are happy and you fit in and I have had that feeling since coming here.
“Rosenborg are a team that have won the division twice in a row and want to play in Europe consistently and those are ambitions I have too.”
The 29-year-old scored just twice in his 17 appearances at the City Ground – including an important goal for the Reds against Newcastle – but the striker hopes to improve his goal record at his new club.
Bendtner said: “I can’t focus on whatever happened in the past, a lot of things happen in a life and people change grow sports wise and as a person.
“I was at a place where I had to make a good decision and I felt this was the right choice for me.”
The announcement of Bendtner caused the Norwegian club’s website to crash for several hours because too many people tried to access their site.