Vansummeren's contract with Garmin expires at the end of the season, and due to the merger with Cannondale, the American team has committed to honouring pre-existing contracts before offering places to riders out of contract.
The Belgian newspaper Het Nieuwsblad has reported that a delay in a contract from Garmin resulted in the 33-year-old looking elsewhere for a team.
The former Paris-Roubiax champion joined the Garmin team from the 2010 season.
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