"He's making nice progress," Maddon said. "[Head athletic trainer Ron Porterfield] believes if he's not right on schedule, it isn't going to be far off that."
If necessary, Jennings would play in a rehab game Sunday, but a decision has not been reached.
Maddon acknowledged Jennings may not be at 100 percent upon his return and could have to play through pain.
"The biggest problem with a thing like that is mis-hitting a ball or swinging and missing can cause the most pain, or even on the defensive side," Maddon said. "Those are things you can guard against somewhat, but you may have to suck up a little buzz in the hand now and then. Desmond is a tough guy."