The veteran striker's deal is running down this season and management are yet to make contact about negotiating an extension.
Lewandowski, 37, told AS: "I feel good after the injury: physically I feel great. I played with the team already three days ago, and for me the most important thing is how I can help the team win.
"When it comes to my future, I am calm: it is not the important time. There are important things now: the team and my national team. I am focused on doing my best to win matches and titles.
"I had a little problem at the end of the season, but now I feel good. When you have a lot of games in a season, it is important to be at your best at the end. I have had two injuries, but I have worked really hard the last two weeks, and now I am at a high level. If we play as a team, we are dangerous and we can win titles. Based on my experience, I am calm, and I know that I can help the team."
Lewandowski added, "First of all, I'm not in a hurry. Ultimately, the most important thing will be how I feel when the season is over. I'll see what I do with my life, but right now I'm focused on scoring goals and winning titles with the team."