No Mercedes engine for Red Bull in 2011
Red Bull Racing are believed to be considering dropping Renault at the end of the season with team boss Christian Horner claiming that his decision will be based on whether the FIA allows Renault to increase their power to match that of Mercedes' units.
This immediately sparked rumors that Red Bull could look to Mercedes, which would mean four teams were reliant on the German manufacturer for their engines.
Mercedes motorsport boss Norbert Haug, though, has all but ruled this out.
"We have probably KERS next year, so we need to look at our capacities," Haug told Autosport. "It definitely would be very difficult for us to supply a fourth team – but no final decision is taken yet.
"We have cut the workforce on our engines, and we also need to prepare in a while for 2013 when there will be no rules. So probably the best decision is to stick with three teams.
"That is not the final decision taken, but probably we will stay as we are."
Mercedes already supply engines to their own Mercedes GP F1 team as well as McLaren and Force India.