The 39-year-old pivot was hurt in Montreal's 41-30 win over the Winnipeg Blue Bombers on Friday night.
Alouettes head coach Marc Trestman said Monday that his quarterback woke up with a sore shoulder and had tests done later in the day.
But Calvillo was back under centre at Als practice Tuesday with an eye on a Week 3 home date with the Calgary Stampeders.
"I'm feeling good and I'm looking to play on Thursday against Calgary," Calvillo said.
The Alouettes and their veteran quarterback will be looking for revenge against the Stamps after Calgary demolished Montreal 38-10 in Week 1.
Calvillo was picked off twice and held to just 16-of-31 passing for 174 yards and a touchdown.