49ers, possibly Patriots, could enter pursuit of Courtney Upshaw

Linebacker Courtney Upshaw launched his free-agency tour with a trip to visit the Jets. If he doesn’t sign there, other teams have interest. Per a league source, the 49ers and possibly the Patriots represent other alternatives for Upshaw, who started 15 games in 2015 and, in all, 55 games in four seasons — including Super Bowl…