Monisha Kalternborn concedes that while Nico Hulkenberg has been "absolutely good" at Sauber, the team has failed to live up to expectations.
With all the rumours flying around it appears to be only a matter of time before Hulkenberg confirms that he is leaving Sauber at the end of this season.
Having lost out on a 2014 Ferrari driver, the German is believed to be leading the chase to replace Kimi Raikkonen at Lotus.
For now, though, he remains a Sauber driver with his team boss conceding that this season - what looks to be Hulkenberg's first and last at the team - has not gone according to plan.
"When you look back to when we announced the partnership, we saw Nico's...
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