Oct. 9 (Bloomberg) -- Bill Gross, the former manager of the world’s largest bond fund who last month took over a new fund at Janus Capital Group Inc., said investors should say “bye-bye” to the days of double-digit returns.

“The world is slowing down,” Gross said in a conversation today with Janus Chief Executive Officer Dick Weil that was broadcast on the firm’s website. “We’re doing the best of them all,” Gross said of the U.S.,“but frankly it’s not like the old normal, it is the new normal where global growth proceeds at a very slow pace.”

He reiterated that returns will be subdued in the new normal, a view he and Pimco first expressed in 2009 coming out of the financial crisis. The 70-year-old Gross took over the Janus Global Unconstrained Bond Fund this week after leaving Pacific Investment Management Co. on Sept. 26. Gross, who co-founded Pimco in 1971 and ran its $201.6 billion Total Return fund, left after his deputies threatened to quit and management debated his ouster, said people familiar with the matter.