De Leon noted the back problem was nothing more than a little tightness and nothing to be concerned about.
"And they were preventing, being cautious, and so they decided to skip a bullpen," De Leon said. "I'm ready to go. I'm feeling great.
"Everything is perfect. I threw my first live BP on Thursday and felt pretty good. So, I'm excited. I want to be in games."
When will Rays fans first get to see the 24-year-old right-hander this spring?
"I'm throwing live BP tomorrow, then I'll be ready to go in games," De Leon said.