Harper will miss the Phillies' first full-squad workout Monday due to illness, Matt Gelb of The Athletic reports.
Harper is absent from Sunday's lineup against Washington.
Harper went 1-for-5 with a two-run home run in Tuesday's 5-1 win over the Brewers.
Harper (elbow) will start at first base and bat third Thursday against the Marlins.
Harper was removed from Wednesday's game against the Blue Jays due to a left elbow contusion, Alex Coffey of The Philadelphia Inquirer reports.
Harper revealed last week that he's been playing through a sore wrist and sore right elbow, MLB.com reports.
Harper went 2-for-3 with two walks, a double, a run scored and an RBI in Monday's 3-2 extra-inning win over the Astros.
Harper is not in the starting lineup for Sunday's game against the Nationals.
Harper went 3-for-4 with a two-run homer in Sunday's win over the Mariners.
Harper (hand) will start at first base and bat third Thursday against the Dodgers.