Heyward, 34, has been dealing with a stiff back for about a week.
Dodgers may recall Miguel Vargas from Triple-A if Heyward needs an injured list stint.
Right-handed relievers Brusdar Graterol and Blake Treinen are making progress in recovering from injuries.
Giants' ace Blake Snell will make his first start of the season, joining a strong rotation with new additions like Kyle Harrison.
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