Two years after rekindling their partnership, Williams confirmed on Thursday that they would swap to Mercedes-Benz power for 2014.
Renault, though, are confident they will still have three or even four teams on their list for next season when F1 switches to 1.6-litre V6 engines.
The French company already has a deal with Red Bull and recently signing Toro Rosso while Jean-Michel Jalinier, the president of Renault Sport F1, expects to make another announcement in the coming days.
"For Renault Sport F1, we have stated on numerous occasions that we would supply up to five teams if there was a requirement to do so, but this would not make sense economically or be ideal for our resources," Jalinier said.
"Three, or up to four, teams is the ideal for us so the departure of Williams normalizes the situation and makes things much clearer from our side.
"We will announce the next team within a matter of days, and then confirm the final stage before the end of June. We remain incredibly motivated about the challenge of the 2014 engines."
Jalinier took the time to bid farewell to Williams, promising to give the team their full support for the remainder of this Championship.
"We would like to thank Williams for the warmth it has extended to Renault over the last two years and wish the team the very best for the future.
"Williams and Renault have a long history together and quickly recaptured its winning spirit in the early days of the rekindled partnership with victory in Spain 2012.
"We will continue to actively work with the team until the Brazilian Grand Prix in November to end the second incarnation of the partnership with results that do justice to its reputation."