"I'm trying to go about it as if it's business as usual," Suppan said. "That's probably something I will think about after."
Suppan, 37, will make his first Major League start since Oct. 3, 2010 on Wednesday as he replaces Cory Luebke, who is dealing with a sore left elbow.
The Padres will make an official roster move before Wednesday's game to add Suppan to the 25- and 40-man roster. The likely move would be moving outfielder Kyle Blanks (shoulder surgery) from the 15-day disabled list to the 60-day DL.
Suppan signed a Minor League contract with the team right before Spring Training and had a 5.87 ERA in three appearances before being sidelined with a strained right triceps. He made two starts in extended spring workouts in Arizona followed by two more starts with Triple-A Tucson, where he had a 12.15 ERA in 6 2/3 innings.
San Diego manager Bud Black said Suppan is to the point where he can throw upwards of 90 pitches on Wednesday.
"I've always been the type of pitcher who goes pitch to pitch," Suppan said. "I got up to 65 [in Tucson] and I feel good, my injury [triceps] feels good."
Suppan has a career record of 138-143 and an ERA of 4.69 in 16 Major League seasons with the Royals, Cardinals, Red Sox, Brewers, D-backs and Pirates. He spent the entire 2011 season pitching in Omaha, the Royals' Triple-A affiliate.