The Giants made a number of roster moves on Tuesday, the team announced, recalling relief pitchers Mike Broadway and Steven Okert from Triple-A.
San Francisco placed George Kontos on the 15-day disabled list with a flexor strain and optioned Chris Heston down to Triple-A to clear space on the 25-man roster.
Tests on Monday revealed Kontos' flexor strain -- the same injury that landed Sergio Romo on the DL last week and the same injury that sidelined Matt Cain for much of the 2015 season.
[RELATED: Giants RHP Kontos has flexor strain]
The 30-year-old is 0-1 with a 1.59 ERA in a league-leading eight appearances this season.
Heston, 28, is 1-1 with a 10.80 ERA in four appearances, allowing six earned runs in five innings pitched.
Prior to Tuesday's game, manager Bruce Bochy was asked about Heston going to the minors.
"Chris was optioned to Sacramento today so he can pitch every fifth day. We're going to start him, try to get him on track. It's not an easy role when you haven't done it, the role that he had. You sit for a week and don't pitch. Then you might pitch back-to-back days," Bochy told reporters. "It's an adjustment, but I think the best thing for Chris and for us is for him to go down and pitch and get his game back. He'll be back up here. It's never easy making a move like this. This kid did such a great job for us last year, but it's been a tough go for him here early and I think it's best for him to pitch every fifth day and start."
When Heston is recalled, will it only be in a starter role?
"We'll see where we at when he's comes back up if we need a starter. But if we need a long guy, he'll learn from this. It's going to be a little easier once he gets back to being who he is. That's commanding the fastball and getting all his pitches over. There's no reason he couldn't be a good long man, it just takes some time to learn that," Bochy said.
Broadway, 29, has allowed three runs in five Triple-A innings this year. He went 0-2 with a 5.19 ERA in 21 appearances with the Giants last season.
Okert, 24, is 1-0 with a 2.70 ERA in four Triple-A games this year. He will be looking to make his major league debut after authoring a 3.82 ERA with 69 strikeouts over 52 appearances with Sacramento last year.