Free-agent wide receiver Brandon Gibson is looking for a fresh start and won’t return to the Rams next season, league sources told the Post-Dispatch on Saturday. The Rams were interested in re-signing Gibson, but only to a point as they attempt the annual task of upgrading their wide receiver corps. In a commitment to young wideouts Chris Givens, Brian Quick and Austin Pettis, the Rams wanted Gibson back in a role and for money commensurate to a No. 3 or No. 4 wideout. But there has been healthy interest in Gibson in the free agent market and plenty of phone calls from other teams as the NFL’s so-called “legal tampering period’’ begin Saturday (or late Friday night outside of the Eastern time zone). Indications are that Gibson will have a chance for a No. 2 role (or at worst a No. 3) with a contract offer expected soon. The free-agency period begins Tuesday afternoon. Acquired by the Rams as part of the Will Witherspoon trade with Philadelphia on Oct. 20, 2009, Gibson has caught 174 passes for 2,090 yards (12.0 yards per catch) with nine touchdowns in 54 games for the Rams. Over Gibson’s 3½ seasons in St. Louis, only Danny Amendola caught more passes (187) and no receiver has had more yards or TDs.