The midfielder has played just three games for Pep Guardiola this season after undergoing surgery on a groin injury but has returned to individual training this week.
The Bundesliga champions confirmed Thursday that the midfielder was back in individual training following rehabilitation of the problem, but the Spain international insists he will not risk aggravating the problem once more in an effort to speed up his recovery.
"The operation went well, and my sports rehab program is on schedule," he told the club's official website. "The important thing for now is to continue training with no reaction to the injury, and get back to a normal training rhythm. What I need now is training, training and more training, so I quickly recover my form. Obviously, I want to be part of it again as fast as possible, but we mustn't go over the top."
Bayern currently tops the Bundesliga and is unbeaten so far in its domestic title defense while sitting on top of Group D in the UEFA Champions League. Despite not having lost in all competitions since defeat to Borussia Dortmund in July's DFL-Supercup, Martinez believes Bayern still has room for improvement.
"We've really been playing very, very well," he said. "The team has improved from match to match, as we put the coach's ideas into practice better and better. We're not at 100 percent yet, but we're on course to get there."