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Nick Heidfeld is determined to win his Renault seat back after being surprisingly replaced by Brazilian driver Bruno Senna 11 races into the season.
Renault replaced Heidfeld with Senna for this weekend's Spa Grand Prix, and for the Italian GP at Monza in two weeks' time -- prompting an angry response from the German driver.
"I was surprised by the team's intention to replace me and regret that things have developed this way," Heidfeld said on his personal website. "I just wanted to be in the cockpit to get the best result for the team and me. I still have a clear contract and I want to drive."
Heidfeld was given a contract to replace Renault's No. 1 Robert Kubica for the F1 season when the Polish driver suffered career-threatening injuries after crashing in a rally car race in February.
The matter could be settled at London's High Court after the Italian GP, with six F1 races following on from there.
Heidfeld's manager Andre Theuerzeit is determined to see Heidfeld reinstated in Singapore at the end of September.
"I am disappointed the team is allowed to let another driver take Nick's seat for the next weekends," Theuerzeit said. "However, I certainly am confident we will be able to enforce a fair solution for Nick in the further proceedings."
Heidfeld is a far more experienced driver than Senna, and secured a third-place finish at the Malaysian GP in April.
However, a recent dip in form saw the 34-year-old fail retiring from the German and Hungarian GPs.