Torres was presented last week but hadn't been added to the squad because Barcelona couldn't make room for him without breaching the Spanish league's strict financial fair play rules.
Neither the club nor the coach have said publicly who is staying and who is leaving, but those four players reportedly have already been told that they are not in Koeman’s plans.
The 2018-19 campaign was a difficult one for Samuel Umtiti, despite winning La Liga with Barcelona and the 2018 FIFA World Cup with France.
Since injuring his knee in September, the Frenchman has appeared in just eight matches in all competitions.
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