Ron Dennis's revelation will only fuel speculation that the world champion will move on at the end of the season, with a return to Renault the most likely.
Italian Jarno Trulli was second while Narain Karthikeyan finished 11th, in the Malaysian Grand Prix.
McLaren are in no rush to sign a successor to departed double world champion Fernando Alonso.
The double world champion made a perfect start to his return to Renault with the fastest time in testing at the Jerez circuit.
Fernando Alonso drove Ferrari's new Formula One car for the first time in Barcelona on Tuesday and said it was on another planet compared to the tricky one he wrestled into title contention last season.
Ferrari's world champion and Formula One leader Kimi Raikkonen took his first pole position of the season at the Spanish Grand Prix.
Fernando Alonso seized pole position from McLaren team mate Lewis Hamilton at the Hungarian Grand Prix.
Double world champion Fernando Alonso was fastest in both free practice sessions for the U.S. Grand Prix on Friday, with McLaren team mate Lewis Hamilton a close second in the afternoon.
Rookie sensation Lewis Hamilton can stretch his championship lead and add to the discomfort of McLaren team mate Fernando Alonso in Sunday's US Grand Prix.
Massa, who failed to score after a bungled pitstop, claims the race should have been cancelled because the sport's leaders allegedly knew before the end of the 2008 season what had happened but covered it up.
The Briton said McLaren are giving him the same chance of winning the title this season as team mate Fernando Alonso.
German champions Bayern Munich are close to signing former World and European champion Xabi Alonso from Champions League winners Real Madrid.
The Spaniard, who trails team mate Lewis Hamilton by four points, said he would need some strange results and some very lucky moves to be champion for a third year in a row.
McLaren sent Fernando Alonso a clear signal on Friday that they would welcome him back, despite a major falling out in 2007, should the Spaniard seek to leave Ferrari.
Fernando Alonso will start his home Spanish Grand Prix as Formula One championship leader for the third year in a row this weekend but with more of a fight on his hands than ever.
Double world champion Fernando Alonso expects to have more overtaking opportunities at his home Spanish Grand Prix next week as a result of changes to the Circuit de Catalunya.
Lewis Hamilton has made the right move in leaving McLaren if he wants to win more Formula One titles, former teammate Fernando Alonso said on Thursday.
Max Verstappen clinched his second win of the season as the Australian Grand Prix was halted with three red flags.
Max Verstappen won the Miami Grand Prix from ninth on the starting grid with a masterful display of tyre management on Sunday.
Fernando Alonso led a Ferrari one-two in the German Grand Prix on Sunday after denying Brazilian team-mate Felipe Massa an emotional victory one year on from a near-fatal crash.
Summary of sports events and persons who made news on Sunday
Max Verstappen leads Red Bull front row sweep in Bahrain
Fernando Alonso blamed blistering tyres for keeping him off the podium in German Grand Prix.
Former champions Michael Schumacher and Fernando Alonso saw red on Sunday after the safety car wrecked their hopes of European Grand Prix success. Schumacher, nine races into a comeback with Mercedes at the age of 41 and after three seasons out, finished 15th after being forced to wait at the pit lane exit for a red light to change to green while the safety car was deployed.
Ferrari's Formula One championship leader Fernando Alonso defied atrocious conditions to take pole position for the German Grand Prix on Saturday.
Exactly how that coup came about has been cloaked in mystery since the news burst like a bombshell on an unsuspecting Formula One last December.
Max Verstappen won the season opener as Red Bull registered a dream start with a one-two finish at the Bahrain GP.
The McLaren driver was crowned driver of the year by Britain's Autosport magazine despite being beaten to the F1 title by Alonso.
Atletico Madrid secured a hard-fought 2-1 home victory over Real Betis in La Liga on Sunday thanks to an own-goal by Rui Silva and a header by Alvaro Morata as Diego Simeone's side ended a three-game winless run in all competitions.
Fernando Alonso delighted his legions of Spanish Formula One fans on Wednesday with the quickest time in testing on an emotional debut for Ferrari. The double world champion, who was cheered on by an astonishing 36,000-strong weekday crowd at Valencia's Ricardo Tormo circuit, played down suggestions of being the early favourite in the title race, however.
The world champion made it clear that he could never forgive or forget what happened in Monza.\n
Alonso's victory at Ferrari's home circuit was his third win in a row this season and the team's fourth in four races.
Renault's Fernando Alonso took his first pole position in nearly two years on Saturday after a Hungarian Grand Prix qualifying session overshadowed by Ferrari's Felipe Massa suffering a heavy crash.
Fernando Alonso has announced his split from his pop star wife Raquel del Rosario after five years of marriage.
Xabi Alonso expects to slot straight into the role of 'conductor' at Real Madrid after completing his desired move from Liverpool on Wednesday.