The 49ers have yet to give Trent Williams an extension, but they did do a solid for their new starting left tackle. San Francisco revised the final year of the veteran’s contract to give him some upfront payment, Ian Rapoport of NFL.com (on Twitter) hears. 
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For months, we heard that Willians would demand a brand new deal from any team that traded for him. However, after he was shipped from the Redskins to the 49ers, Williams said he was willing to put extension talks on the back burner. With that, Williams is set to play out the last season on his original D.C. deal, one that pays him $12.5MM in base salary. But, thanks to the recent adjustment, it’ll come with some guaranteed cash. Before, that sum was completely non-guaranteed.
Williams has been out of football for more than a year and he’s undoubtedly eager to prove himself all over again. The multiple-time Pro Bowler will take over for SF legend Joe Staley, who kept his retirement plans on the hush until the Niners were able to secure his replacement.
The Rams were in the mix to trade for Williams, even though they’ve got limited cap flexibility and a massive Jalen Ramsey extension on the docket. The Vikings were also a frontrunner for Williams, and they would have given him an extension, but the left tackle may have blocked that deal. Instead of money and security from Minnesota, Williams will reunite with Kyle Shanahan in the Bay Area.
I wonder if this frees up money for a Kittle extension?
or garrapolo
Probably