By Chad Finn, Globe Staff

Dale Arnold's contract at WEEI expired today. But he's not going anywhere.

Arnold, who has been on the station's airwaves since it switched to an all-sports format in September 1991, will remain at WEEI in a slightly expanded role.

Under his new deal -- terms have not been confirmed -- he will add some Saturday duties to his current weekend role as the host of the morning "Sports Sunday" program, and he will also be the primary fill-in for morning drive hosts John Dennis and Gerry Callahan and afternoon drive personalities Glenn Ordway and Michael Holley.

His decision to remain at WEEI was a mild surprise given the events of February 2011, when Arnold was blindsided by a programming shakeup that left him without a weekday role.

Holley, Arnold's co-host since March 2005 on WEEI's midday show, was paired with Ordway and moved into the more prominent day part.

Arnold, who had worked with such varied co-hosts as Eddie Andelman, Bob Neumeier, and Holley, was demoted to fill-in and weekend duty and occasional play-by-play.

Mike Mutnansky and Lou Merloni took over the the midday program and have struggled in the Arbitron ratings compared to their counterpart at competitor 98.5 The Sports Hub.

There was some backlash against WEEI and parent company Entercom's decision to demote Arnold when the Bruins made their run to the Stanley Cup.

Arnold, formerly the team's play-by-play voice on NESN, discussed hockey (as did Holley) when it was a subject of mockery on other WEEI programs.

He gave up his role calling Bruins games on NESN in 2007 when the network wanted him to call road games. He decided he could not do so because of his commitment as co-host of WEEI’s midday program.

Arnold returned to NESN in September as the studio host for Bruins telecasts. That will remain his primary job.