McLaren team principal Martin Whitmarsh said it was crucial for the team to agree a new engine deal with a car manufacturer.
The team announced last week it will reunite with former engine supplier Honda in 2015.
“McLaren needs to be supported and teamed in a full works effort with a major automotive manufacturer,” said Whitmarsh at a Vodafone McLaren Mercedes phone-in.
“We’re going to be doing all we can to win races with Mercedes this year and next, but inevitably moving to Honda in 2015 gives us a bedrock of being one of the big teams.
“It ensures that in the long term we have the resources, the correct structure and focus, to be successful.”
Whitmarsh added the switch between engine suppliers, which will come after the first year of F1’s new engine regulations, will be “a tough challenge for the team”.
McLaren and Honda won their first race together in the 1988 Brazilian Grand Prix and their last race together in the 1992 Australian Grand Prix. During that period they amassed 44 wins out of a possible 80, four consecutive constructors’ championship victories and four drivers’ titles won by Ayrton Senna (three) and Alain Prost (one).
Driver Jenson Button will be reunited with Honda having used their engines between 2003 and 2008.
Acura, Corvette and Lexus teams were the winners in the IMSA WeatherTech SportsCar Championship points standings and results from Sunday’s Acura Sports Car Challenge at Mid-Ohio Sports Car Course.
Leading the way for the overall title were the DPi duo of Ricky Taylor and Helio Castroneves. The Acura No. 7 drivers earned their third consecutive victory for Team Penske, which last won three straight sports car races during the 2007 American Le Mans Series.
Other class winners at the Lexington, Ohio, road course were the No. 3 Corvette C8.R of Jordan Taylor and Antonio Garcia in GTLM and the No. 14 Lexus RC F GT3 of Jack Hawksworth and Aaron Telitz in GTD.
Here are the race stats, points and results from the IMSA WeatherTech SportsCar Championship race at Mid-Ohio:
RESULTS: Click here for the overall finishing order and here for the class breakdown.
POINTS: In the DPi division, the No. 10 Cadillac of Ryan Briscoe and Renger van der Zande lead the points standings. No. 3 Corvette drivers Taylor and Garcia are tops in GTLM.
In GTD, the No. 86 Acura NSX GT3 of Mario Farnbacher and Matt McMurry leads the points over Telitz and Hawksworth.
STATS PACKAGE FOR MID-OHIO:
Fastest laps by driver
Fastest laps by driver after race (over the weekend)
Fastest laps by driver and class after race
Fastest lap sequence
Race analysis by lap
Best sector times
NEXT: The IMSA WeatherTech SportsCar Championship will race with its GT divisions Oct. 9-10 at the Charlotte Motor Speedway Roval.