Doumbia, who spent the first half of the season on loan with Russian club CSKA Moscow, has a great scoring record in Europe and McClaren hopes he bring that with him to St James' Park.
"They have done a great job but we have brought in another forward to give them some help.
"It is no secret that we have been looking to add to our options in the striking area. We have been searching for a forward and were delighted when the opportunity arose to take Seydou on loan.
"He is a natural goalscorer, someone who has done it in the Champions League and has played at the highest level.
"He's someone who plays on the shoulder of defenders, runs in behind and gets on the end of things. We have been looking for that type, and so are delighted to have Seydou on board."