Back in mid-November, Barry Zito's agent, Scott Boras, let it be known that the left-handed pitcher would attempt a comeback in 2015.
Zito was out of baseball in 2014 after the Giants declined his option and paid him $7 million so he wouldn't be on the roster.
On Tuesday, the 36-year old reportedly threw for a select group of teams, in the hopes of getting a spring training invite.
Should Zito pitch in the big leagues again, it's unclear whether he will return as a starter or come out of the 'pen.
"I don't know if he's gonna be able to go back and make that transition into the bullpen," Giants broadcaster Mike Krukow told KNBR 680-AM Wednesday morning. "I'm glad he's trying to come back. I've always believed if you've got one pitch left in there it's gonna haunt you until you go back and throw it. And he never did say he was gonna retire. I think it was his plan all along."
From 2000 to 2009, Zito made 320 starts with one appearance out of the bullpen in 2007 (his first season with the Giants).
In 2010, he registered 33 starts and one relief appearance.
In 2011, a foot injury limited Zito to just nine starts to go along with four relief appearances.
The 2002 Cy Young winner made 32 appearances (all starts) in 2012, and 25 of his 30 trips to the mound in 2013 came as a starter.
"I think he's more suited as a starter, just because if you're gonna be a reliever you either gotta be a strikeout guy or you gotta be a groundball guy, and I don't really think he's either one of those guys anymore," Krukow explained. "I just think he's a guy that his goal is to try and take the sting out of your at-bat. Make you get off balance.
"Hey, he may prove me wrong and I hope he does. I hope to see him back because we all know Barry Zito is really one of the great guys that's ever come through Mike Murphy's clubhouse."