Lewandowski is contracted to the Bundesliga champion until June 2023 and Barca has been linked with a move for the prolific striker.
Bayern's management has met Pini Zahavi, Lewandowski's agent, as the Bavarian giant endeavours to keep the 33-year-old.
Nagelsmann is hopeful that an agreement can be reached.
The Bayern head coach said: "I asked if it was a good conversation. And it seems that it was. But there is nothing to report, in any sense.
"My position has not changed, we want to keep it as it is and extend his contract."
Nagelsmann is prepared to wait for Lewandowski to come to a decision over his future.
He said: "You know that Pini likes to negotiate and so you need a little patience. But that's one of my great strengths."
Lewandowski last week became the first player to score at least 34 Bundesliga goals in three consecutive seasons.
The Poland captain has found the back of the net an astonishing 49 times in all competitions in the 2021-2022 campaign.