Messi, who turns 38 this summer, has not announced his plans for the 2026 tournament, which being held in the United States, Mexico and Canada.
The eight-time Ballon d'Or winner was the Most Valuable Player of Argentina's run to the championship at the 2022 World Cup in Qatar. Argentina have already qualified for 2026.
In an interview with Madrid-based El Pais, Suarez was asked whether he and Messi had talked about retirement.
"No, we do talk (about it). Jokingly, many times, but he (Messi) also has that desire to play in next year's World Cup," Suarez said.
"Obviously, after being away from the national team for a while, that desire is fading more on my side than on his, but we haven't talked about it (retirement) yet."
Suarez, 38, of Uruguay, acknowledged that Messi had not confirmed he will play in the 2026 event.
"No, no, no, I don't ask him either. I know what he is like and I don't ask him anything regarding that. Time will tell," Suarez said.
Messi made his World Cup debut as an 18-year-old in 2006 and also competed in the global competition in 2010, 2014 and 2018 before lifting the trophy in 2022.
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