The European branch of Sega now has a hole in its upper management as recently-appointed COO and president Chris Bergstresser leaves the company.

As reported by GamesIndustry, no reason has been given for the exec's departure, but Sega says that his leaving is on 'strong terms'. Sega West chief Tatsuyuki Miyazaki is stepping up to the plate as interim CEO and president while a replacement is hunted down.

Bergstresser joined back in August, replacing long-serving COO Jurgen Post who has departed for Chinese tech and entertainment giant Tencent.

Bergstresser's hire four months ago was actually a return home, as he started out life in the industry at that company back in 1991. Since then he has held roles at the likes of Konami, Atari, Miniclip and Nitro Games.

"On behalf of the whole business, I would like to thank Chris for his hard work, integrity and his professionalism during his time at the helm of Sega's European operation," says Miyazaki.

"We wish him all the best for the future. I am looking forward to taking on the temporary role of COO and President as the business continues to evolve and grow. It's an exciting time for SEGA Europe and working with the talented team here, I am confident that its future remains as bright as ever."