Nick Chester concedes not all Lotus' problems are because of Renault and is "pretty confident" they won't suffer the same fate next season.
Last season Lotus were fighting for race wins, this year the team is struggling to get close to the points.
With just two top-ten finishes from 11 grands prix, the team has eight points and is eighth in the Championship.
Many of Lotus' woes have been blamed on the team's Renault engine, which has lacked both power and reliability.
Chester, however, concedes not all the blame belongs to Renault.
Asked by the official F1 website if the team's struggles were 'tied entirely to problems with the power unit', Chester said: "I suppose not...
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