For a one-off movie?
Is this a one-off movie like Rogue One?
Rogue One was limited by the premise, and it was intended to test the waters. A young Han Solo movie pretty much begs for sequels. I haven’t seen (or looked for, frankly) any sequel speculation, but keeping in mind the franchise mentality I’d say it’s a safe bet.
I know I wouldn’t sign the guy for this part without a few clauses addressing sequels, reshoots and whatnot.