Listen to BBC local radio commentary as Durham host Sussex in County Championship Division Two.
Graham Clark's unbeaten 73 ensures Durham close just 25 runs behind Sussex on day two at Chester-le-Street.
Durham coach Jon Lewis says transfer fees may "soften the blow" of player exits, but that the system could "bring problems".
Luke Wells scores his third century of the season on his debut as Sussex captain before his side collapse against Durham.
Audio & Video
With his contract up at the end of the season, Durham's record first-class wicket-taker Graham Onions ponders the future.
Analysis and opinion from the BBC's cricket correspondent.
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