Earlier, Wolff played down reports Mercedes could be eyeing the frustrated Ferrari driver Fernando Alonso, while Mercedes' 2014 star Lewis Hamilton was this week spotted at Ferrari's Maranello headquarters.
Nico Rosberg's place at the silver-clad team was also in doubt until team figures declared the 28-year-old German in fact has a "long term" contract.
Also committed to Mercedes is Hamilton, Austrian Wolff told a group of Spanish reporters at the team's Brackley headquarters this week.
"Our drivers have contracts for two years, so we cannot consider any possibility," Wolff is quoted by Marco Canseco, the correspondent for the Spanish sports daily Marca.
When asked about Alonso, Wolff answered: "Everyone knows that he is one of the best drivers on the grid, and one that fits with what Mercedes wants.
"But we already have two of the best," he added.