INDIANAPOLIS (CBS Sports) – There is going to be at least one significant trade this offseason. This much we know.

The San Francisco 49ers will trade Alex Smith, and, according to league sources, the deal has effectively already been agreed to. No trades can be official until the league year begins March 12, so nothing can be finalized now, but sources said the two teams involved have the key terms in place at this point, and will finalize it down the road.

READ MORE: Steph Curry, Draymond Green Ready For Play-In Game; Warriors To Take On Lakers Wednesday Night

Reporting from the scouting combine in Indianapolis, CBS Sports NFL Insider Jason La Canfora said, at this point, he doesn’t know the identity of the other team involved, but the 49ers have made it clear they are moving Smith and he will not be a part of the team this year.

READ MORE: Demonstrators Call on San Francisco to Keep Great Highway Closed to Cars

Read The Rest Of The Details From CBS Sports.

MORE NEWS: Marin County Steps Up Effort to Vaccinate Youth

(Copyright 2013 by CBS San Francisco and CBS Interactive. All rights reserved. This material may not be published, broadcast, rewritten or redistributed.)