Soto (calf) took live batting practice at Citi Field on Wednesday, Chelsea Janes of SNY.tv reports.
Cubs manager Craig Counsell said Wednesday that Brown (neck) suffered a setback during his live batting practice session Tuesday, Meghan Montemurro of the Chicago Tribune reports.
Conforto is out of the lineup for Wednesday's game against the Diamondbacks.
Happ is not in the lineup for Wednesday's contest in Arizona.
Happ went 1-for-4 with a three-run home run in Tuesday's 5-4 loss to the Diamondbacks.
Webb (6-4) allowed two runs on one hit and one walk without recording a strikeout in one inning, taking the loss and a blown save in Tuesday's 5-4 loss to the Diamondbacks.
Holmes allowed two hits and two walks while striking out five over seven scoreless innings in a no-decision versus the Diamondbacks on Tuesday.
Robert went 2-for-4 with a solo homer during Tuesday's 3-2 extra-inning win over Milwaukee.
Lindor went 2-for-4 with a solo home run during the Mets' 3-2 extra-inning win over the Brewers on Tuesday.
Robert went 2-for-4 with a solo homer during Tuesday's 3-2 extra-inning win over Milwaukee.
