Katie Stratman-USA TODAY Sports

The Cincinnati Reds scratched left-hander Brandon Williamson from his Sunday start against the visiting Chicago Cubs after the 25-year-old tested positive for COVID-19, the team announced Saturday.

Williamson is the fourth Cincinnati pitcher to test positive this week. The others are right-handers Hunter Greene, Ben Lively and Fernando Cruz.

Reds manager David Bell said a couple of support staff members also have tested positive.

"We're taking some precautions, for sure," Bell said prior to Saturday's game against the Cubs. "Not letting anyone in the clubhouse. We've asked anyone who's absolutely not necessary to not be in there."

The Reds reportedly sat on an airport tarmac for more than eight hours last Sunday in Phoenix after their charter plane had mechanical issues.

Three nights later, Greene was placed on the COVID-19 list after pitching at the San Francisco Giants. Cruz and Lively were placed on the list in between games of Friday's doubleheader against the Cubs.

Players must miss at least seven days if they are placed on the COVID-19 list.

Cincinnati hasn't yet announced a new starter for Sunday's game.

Williamson is 4-4 with a 4.20 ERA in 19 starts for the Reds this season.

Greene is 3-6 with a 4.75 ERA in 17 starts, Lively is 4-7 with a 5.17 ERA in 15 appearances (12 starts), and Cruz is 1-1 with a 4.12 ERA in 48 appearances (one start).

Also, Reds right-hander Graham Ashcraft (toe) was placed on the 15-day injured list. Ashcraft, who was injured against the Cubs on Friday, is 7-9 with a 4.76 ERA in 26 starts.

Left-hander Chasen Shreve and right-hander Connor Phillips were recalled from Triple-A Louisville. Infielder Alejo Lopez was sent to the Bats.

More must-reads:

TODAY'S BEST
Timberwolves mount incredible second-half comeback to stun Nuggets in Game 7
Watch: NASCAR drivers exchange punches after crash in All-Star Race
Knicks star offers passionate defense of HC Tom Thibodeau after Game 7 loss
Xander Schauffele proves doubters wrong with historic win at 2024 PGA Championship
Canucks won't have linchpin forward for Game 7 vs. Oilers
Pacers ride historic shooting performance to Game 7 blowout of Knicks
Watch: Aaron Judge blasts 13th home run in Yankees' seventh straight win
Knicks' Jalen Brunson suffers serious injury in Game 7 vs. Pacers
Phil Foden lifts Manchester City to fourth consecutive English Premier League title
Dodgers add recently acquired left-hander to active roster
Report: 2023 No. 7 pick expected to terminate KHL contract, join Flyers
Mavericks advance to Western Conference Finals aided by controversial call late
Connor McDavid, Oilers hammer Canucks to force Game 7
Tyson Fury-Oleksandr Usyk epic increases excitement for potential rematch
Seize the Grey wins in muddy Preakness
Even Mike Budenholzer admits the Suns need a point guard
Watch: Juan Soto's first multi-homer game as a Yankee
Xander Schauffele, Collin Morikawa lead at PGA Championship
Knicks could get major boost for Game 7 showdown with Pacers
Giants All-Star pitcher suffers setback in recovery from injury