The Kansas City Royals are confident no other players will develop chickenpox after Kelvin Herrera and Alex Rios were diagnosed last weekend.

Ned Yost said Thursday that Herrera and Rios were both recovering quickly and that they could come to the ballpark early Friday for a workout. They would be sure to leave before the rest of the team arrived to start a three-game series against the Chicago White Sox.

Herrera and Rios came down with chickenpox while in Tampa Bay, raising concern that others in the organization might have been exposed.