By Foo Yun Chee and Stephen Nellis

BRUSSELS (Reuters) -Microsoft Corp President Brad Smith said on Tuesday the U.S. software giant has agreed to a 10-year licensing deal that will bring Activision games to Nvidia Corp's gaming platform.

The announcement was the latest effort by Microsoft to convince regulators, especially in Europe, that its plan to buy video game maker Activision should not be blocked on antitrust concerns.

Smith told a news conference he was now more optimistic of getting the Activision acquisition done after the Nvidia licensing deal as well as a similar arrangement with Nintendo Co Ltd.

Smith also said Nvidia supports the Xbox maker's bid to purchase Activision, which has come under scrutiny by antitrust regulators in the United States and Europe. European officials issued Microsoft a warning about the deal earlier this month, while the U.S. Federal Trade Commission has asked a judge to block the deal.

Nvidia said in a press statement that it has struck a 10- year deal with Microsoft to immediately start work on integrating Xbox games into its GeForce Now streaming games service, which has 25 million users in more than 100 countries.

Smith said he hoped that rival Sony Group Corp will consider doing the same type of deal with Nvidia.

Sony has led opposition to the Microsoft-Activision deal, saying last year it was "bad for competition, bad for the gaming industry and bad for gamers themselves."

Apart from Sony and Nvidia, companies including Alphabet Inc's Google had expressed concerns to the FTC about the deal, according to media reports.

Microsoft has pledged to keep "Call of Duty" on Sony's PlayStation. The popularity of the first-person shooter franchise is undimmed nearly two decades after launch, with the latest installment achieving $1 billion sales in its first 10 days in October.

The U.S. tech giant has said the deal is about more than "Call of Duty." It has said buying the company that also makes "Overwatch" and "Candy Crush" would charge its growth in mobile, PC, and cloud gaming, as well as consoles, helping it compete with the likes of Tencent as well as Sony.

(Reporting by Foo Yun Chee in Brussels and Stephen Nellis in San FranciscoEditing by Peter Henderson and Matthew Lewis)