Mitsui Fudosan Co. is poised to make a bid for Tokyo Dome Corp., helping the operator of one of Japan’s largest stadiums push back against activist investor Oasis Management Co.

The Japanese real estate company is preparing to make a tender offer of about ¥100 billion ($960 million) for Tokyo Dome, people with knowledge of the matter said, asking not to be identified before an announcement. Yomiuri Shimbun, the owner of the Tokyo Giants baseball team, is planning to join the bid, one of the people said.

The boards of Mitsui Fudosan and Tokyo Dome were to discuss a tender offer at respective meetings on Friday, the companies said in separate statements. They said they weren’t the source of media reports. A spokesman for Yomiuri Shimbun was not immediately able to comment.