Steve McClaren was also delighted to have secured the forward.
The Magpies were keen to add a striker to their ranks in the January transfer window, with it having been a department they have struggled in this season.
They moved quickly on transfer deadline day to try to fix that problem, securing Doumbia on loan from Roma until the end of the campaign.
And speaking after the deal had been complete, the striker labelled the move a dream come true, saying he is ready to go from the off at St James’ Park.
“I’m delighted to be a Newcastle United player,” the Mirror reports him saying.
“I’ve already started to prepare. I’ve arrived and I’m ready to go. It has always been a dream to play in the Premier League and now that dream has come true, so I’m absolutely delighted.
“I am looking forward to helping the Club get some wins and climb the table.”
Steve McClaren was also equally delighted to complete the signing after enjoying a busy January so far.
The manager has moved to strengthen his squad significantly for the second half of the campaign, with Doumbia joining midfielders Jonjo Shelvey, Henri Saivet and Andros Townsend in those that have arrived at the North East.
And he expressed his pleasure at getting this latest move over the line, saying he is convinced that the striker will make an impact on the team.
"We have been searching for a forward and were delighted when the opportunity arose to take Seydou on loan,” BBC Sport reports him saying.
"He is a natural goalscorer, someone who has scored goals in the Champions League and has played at the highest level. We believe he can make a mark in this team."