Toto Wolff has admitted that Williams might be getting lined up as a Mercedes 'B team'.
"The Ferrari-Sauber model shows that such alliances can be very important in the future in order to remain competitive," Mercedes team boss Wolff told Le Figaro.
"We are watching the situation closely. We already have a cooperation with Force India, which has our support. We are currently wondering if there might be a similar partnership with Williams."
The 2018 campaign continues today with the German Grand Prix.