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8/27/2014 9:10 P.M. ET

Sanchez likely lost for season with concussion issues

SAN FRANCISCO -- Giants catcher Hector Sanchez is continuing to endure unpleasant post-concussion symptoms and almost surely will miss the rest of the season.

Manager Bruce Bochy rated Sanchez's chances of returning to the active roster in 2014 as "very slim."

Sanchez returned from visiting Dr. Michael Collins, a Pittsburgh-based expert on sports-related concussions, who urged the 24-year-old switch-hitter to refrain from baseball-related activities for at least three more weeks and limit his workouts to light exercising.

"There's nothing he can do about it," Bochy said of Sanchez. "He just needs more rest."

Sanchez admitted Wednesday that he felt nauseous and dizzy during recent attempts to exercise. He added that he's having trouble sleeping and feels low on energy.

Sanchez said that Dr. Collins suggested a regimen of light exercises to perform, such as jogging and agility drills, and wants to re-examine him after three weeks.

"I have to be positive that I'll be fine," said Sanchez, whose progress was halted when he sustained his second concussion of the season earlier this month during a Minor League injury rehabilitation assignment with Triple-A Fresno.

In 66 games with the Giants this year, Sanchez has hit .196 with three home runs and 28 RBIs.

Bumgarner's near no-hitter doesn't surprise Giants

SAN FRANCISCO -- Madison Bumgarner's one-hitter Tuesday night was another in a series of efforts when he appeared to be on course for throwing a no-hitter. The Giants firmly believe that he'll someday accomplish the feat.

Bumgarner maintained a perfect game against Colorado for seven innings Tuesday before Justin Morneau doubled leading off the eighth inning. Two years ago, Bumgarner no-hit Colorado for 5 1/3 innings on April 12, then finished with a one-hitter against Cincinnati on June 28 after fashioning five no-hit innings.

In 4 1/2 big league seasons, Bumgarner has made 26 starts in which he pitched at least seven innings and allowed four hits or fewer.

Right-hander Ryan Vogelsong has long regarded a Bumgarner no-hitter as imminent.

"It's not just this year. I've thought that in the past," Vogelsong said Wednesday. "He definitely has everything it takes to do it, not just stuff."

Pointing out that Bumgarner struck out the next four Rockies batters following Morneau's hit, Vogelsong added, "He has the mentality. You saw that last night. After he gave up that hit, he very easily could have lost his focus. He didn't even come close to that."

Said manager Bruce Bochy, referring to Bumgarner, "Any time you have a pitcher with his stuff, command and demeanor, you think he has a good chance to do it."

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.