The 36-year-old was hooked off in the 86th minute of Poland’s 1-0 World Cup qualifier win over Lithuania and played just 24 minutes in the subsequent 2-0 win over Malta.
Speaking to the press after the game, the veteran striker played down any rumours of a potential injury.
Lewandowski said: "I feel much better than before the training camp, because I had some discomfort in the last three games, for example, I couldn't kick with my right leg even once, during the warm-ups.
“Now, everything is back to normal, so it's a plus that I’m back to the fitness I had two or three weeks ago.
"I prepared for the end of the season to maintain that freshness. I knew this season would be different than usual, because in January there was the Champions League.
“I'm not going to lie. Somewhere in the back of my mind I thought about giving everything during these last two, two and a half months and maintaining this freshness and dynamic."
The striker has been a key player in Hansi Flick’s free-scoring Barcelona side, scoring an impressive 35 goals and providing three assists in his 40 games across all competitions.