On Saturday, Silva said he wasn't happy about how Riggins told him there was a chance the right-hander may have to go to the Minor Leagues. Silva said Riggins "has to learn he's in the big leagues now, know what I mean? There's no kids around here anymore."
This is Riggins' first season as the Cubs' pitching coach after three years as the Minor League coordinator.
"Carlos has his opinion and I'll leave it at that," Riggins said Sunday. "I try to stay positive with everybody. It's water under the bridge and today's a new day."
Manager Mike Quade and general manager Jim Hendry both supported Riggins.
"I appreciate that," Riggins said. "I just do my work, and I'm pleased with myself and have confidence in my ability and try to be positive with everybody here every day."
Silva did show improvement in his last outing, but Andrew Cashner, Marcos Mateo and Casey Coleman pitched better. There wasn't room on the 25-man roster for Coleman, who was assigned to Triple-A Iowa.
"His attitude was good, we worked good together," Riggins said of Silva.
Was he caught off guard by Silva's comments?
"In this game, nothing would surprise me," Riggins said.