Barcelona rejected a loan deal from Olympiakos for Cáceres until the end of the season. Olympiakos which is managed by Valverde, made an offer for Cáceres for a loan deal, but Barcelona rejected the deal on the grounds that since they are in all 3 competitions they will need all their players.
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I think a loan deal would have been great for him, he would get regular playing time and then return during the preseason where Pep can evaluate him again.