The Williams team could be set for a move to Mercedes power for the change in engine regulations next season, switching from current supplier Renault.
The Grove based team recently rejoined Renault after a stint with other suppliers such as Toyota and Cosworth, however with the price tag on the new engines as much as €5m more than the nearest competitor, Williams is looking to change again.
German publication Auto Sport und Motor claim that change could be to Mercedes.
"Williams could change," said correspondent Michael Schmidt, "because the contract is expiring."
The change of a midfield team such as Williams also increases speculation over fellow Renault engine users Caterham, the team, currently fighting at the back of the grid with Marussia, is on a lower budget than Williams.
Certainly that raises the question if Williams can't afford Renault's new engines then surely neither can Caterham.
Fellow back-markers Marussia are also tipped for a change next year, this time Ferrari is the supplier being mentioned as Cosworth look set to leave F1 at the end of this season.
Further speculation circulating the Monaco paddock is McLaren's new engine supplier Honda could fast-track it's return to F1 from 2015 to 2014.
Auto Sport und Motor's Schmidt reports: "Right now this is no more than a rumour."
Meanwhile McLaren's current supplier Mercedes is said to be concerned about data that McLaren could gather from it's 2014 unit, should Honda not fast-track, and then pass it on to the Japanese supplier who would be busy in development for it's own V6 turbo unit.
Mercedes chairman Niki Lauda told reporters: "We will give McLaren only the information about our engine that they desperately need."
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