The 49ers may have found Joe Staley’s replacement for now. But in a year, they might have to replace the replacement.

When Staley retired, the 49ers traded a 2020 fifth-round pick and a 2021 third-rounder to Washington for seven-time Pro Bowl left tackle Trent Williams. Williams is the best left tackle in the NFL when healthy. But he will be a free agent in 2021, and there’s no guarantee he’ll re-sign with the 49ers.

“Contract wise, we both agreed to take a wait-and-see approach,” Williams said Thursday on a video conference with Bay Area reporters. “It’s the last year of my deal. Obviously there’s incentive for me to play well. And obviously they had to give up a third-rounder next year, so they’re kind of invested in the deal as well. I think both parties are interested in something long term, but I’m more than OK with just getting my feet wet and playing it out.”