The 21-year-old stayed in Germany after attracting interest during the summer window and has made a strong start to the new campaign, registering three goals and two assists in his first six competitive appearances.
Nusa joined Leipzig from Club Brugge in 2024 after establishing himself as one of Norway's promising attacking players. He scored four goals and supplied three assists in 31 Bundesliga appearances last season.
That form has continued to attract attention, with Fussball News reporting that Arsenal and Tottenham are pushing hardest for his signature.
Arsenal are reportedly preparing an offer worth around €40 million, although Leipzig are not currently keen to sell Nusa during the January window.
A move may therefore have to wait until next summer, when Leipzig are expected to consider offers for the winger.
Newcastle United and Aston Villa are also said to be monitoring Nusa, while Italian clubs Milan, Inter, Juventus and Napoli have been linked with the Norway international.
Bayern Munich, Barcelona and Atletico Madrid are also reportedly following his progress in Germany.
Despite the growing interest, Nusa is understood to be comfortable with his current situation and has settled under new Leipzig head coach Martin Demichelis.
RB Leipzig are reportedly looking for between €60 million and €65 million if they eventually agree to sell.
Nusa's current contract runs until 2029, giving the German club considerable control over his future and allowing them to resist offers that do not meet their valuation.
The winger has also established himself at international level, scoring nine goals in 33 appearances for Norway.
For now, Leipzig's position means Nusa is expected to remain in Germany beyond the next transfer window, even as Arsenal and Tottenham continue to monitor his situation.
His performances this season are likely to keep the transfer speculation alive, with the Premier League clubs among those watching closely. That makes a January departure increasingly unlikely, with Leipzig holding out for a much larger fee in the longer term.