Web search leader Google, which is buying the handset maker to boost its patent portfolio, is seen winning unconditional EU clearance for the deal next week, two people with knowledge of the matter said on Friday.
The tentative deal was announced last August.
The U.S. Justice Department is also expected to approve the acquisition next week, two separate sources who are close to the antitrust review told Reuters on Thursday.
The European Commission is scheduled to decide by Monday whether to clear the deal.
The Commission is expected to clear this deal without requiring any concessions from Google, one of the people said.
The European regulator is expected to say the deal will not stifle competition, two of the people said.
One of the people said it was possible the Commission could decide on Monday to open an in-depth investigation into the deal instead of clearing it, but that this was highly unlikely.
While the Justice Department and the Commission are coordinating their actions, it is possible the decisions may not come on the same day, another source familiar with the matter said.
Representatives for Motorola and Google declined comment.
After U.S. and European approval, the companies would still need approval from China, which has until March 20 before it has to decide if it will approve the deal or start phase three of its deal review. Also, regulators in Israel and Taiwan have yet to sign off.
Google announced in August that it would buy Motorola for its 17,000 patents and its 7,500 pending patent applications as it looks to compete better with rivals such as Apple Inc
The legal patent war among technology and smartphone makers has prompted the Commission to open an investigation into legal tactics used by Samsung Electronics <005930.KS> against Apple and whether these breach EU antitrust rules.
Earlier this week, Google pledged to license Motorola patents on fair and reasonable terms if the deal succeeds.
In letters to standard-setting organizations around the world, it promised to keep a cap on the fees it charges for licensing its technology. That cap would be 2.25 percent of the net selling price for each phone. Google also outlined the conditions under which it would sue companies for patent infringement.
In 2010, U.S. business software maker Oracle Corp
Google shares were down 0.7 percent at $607.35 and Motorola Mobility shares were down 0.2 percent at $39.27 at midday on Friday.
(Additional reporting by Jeremy Pelofsky and Diane Bartz in Washington D.C. and Sinead Carew in New York, editing by Matthew Lewis)