Former Pimco co-CEO Mohamed El-Erian told CNBC on Wednesday he believes the Federal Reserve will drop the "considerable period of time" phrase, a reference to how long policymakers intend to keep rates low.

"You've got to remove the wording to move on rates in the middle of next year," El-Erian said on "Squawk Box" ahead of the the Fed's final policy statement of the year. "The Fed has tried to be transparent. It cannot leapfrog immediately to a rate hike."