"I think looking forward to the future we want to make sure we have the best plan possible so I can come back strong," Pagan said Tuesday.
Said Giants manager Bruce Bochy, "We don't know enough to say if it's gotten worse or if it's a one-day deal."
Pagan, who has a bulging disk in his back, hopes that Watkins can guide him and the Giants' medical staff in the right direction.
"We've been doing everything -- treatment, rest, medication, injections," said Pagan, who has received at least two painkilling shots. "We want to see if there's anything, a different treatment we can do, to make it better."
Pagan emphasized that surgery, which probably would end his season, currently is not being considered.
Chris Haft is a reporter for MLB.com. Read his blog, Haft-Baked Ideas, and follow him on Twitter at @sfgiantsbeat. This story was not subject to the approval of Major League Baseball or its clubs.