Ryan also said Mauer would not travel to Arlington when the Twins take on the Rangers this weekend.
"He felt better today, so that helps the cause," Ryan said. "He was better today than he was yesterday. And he was better yesterday than he was the day before."
Mauer was at Target Field on Wednesday and was doing some light activity in the weight room.
"He was doing some exercises," Ryan said. "He's moving around in there. He's doing some stretches and stuff -- at least he's active and so forth, feeling a little better."
Teammate and good friend Justin Morneau shared some advice with Mauer after recovering from a concussion of his own in 2010.
"The only thing I told him is rest is the most important thing," Morneau said. "If you're not feeling good and you think you need to go lie down, then go do that. That's going to help you get better quicker. The more you try and fight through it like you would a sore hamstring or a sore elbow or something -- some things you can play with -- this isn't one of those things you play with, because the longer you put it off or the longer you try and wish it's not there, the longer its going to take to heal."
Morneau sustained his concussion July 7, 2010, when sliding into second base, and he missed the remainder of the season and the playoffs as he recovered. The first baseman noted that, based on his experience, everyone experiences concussion symptoms differently and that there was no way to put a timetable on the recovery process.
"The things that make it worse or make it better are different for everybody," Morneau said. "It's one of those things it's so hard to figure out. It's a tough thing to go through. And, I've said this before, I wouldn't wish it on my worst enemy. It's one of those things, the unknown is what makes it so frustrating. Hopefully it's a short process for him."
Rhett Bollinger is a reporter for MLB.com. Read his blog, Bollinger Beat, and follow him on Twitter @RhettBollinger. Kelly Erickson is an associate reporter for MLB.com. This story was not subject to the approval of Major League Baseball or its clubs.