In September, Marner's agent Darren Ferris said the preference would be to wait until the summer to sign despite productive discussions with general manager Kyle Dubas. On Wednesday, Ferris assured their position hasn't changed.
"Yes, 100 percent," Ferris told The Athletic's Pierre LeBrun. "Mitch wants to concentrate on this season."
Marner is in the midst of a breakout campaign and currently ranks eighth in league scoring with 55 points in 42 games.
The Maple Leafs also face a critical negotiation with fellow restricted free agent Auston Matthews with a projected league-wide salary cap increase and $23.2 million available to spend for next season, per Cap Friendly.