The former Arsenal captain is yet to make his debut for Barca since his summer arrival.
Enrique explained: "What's happening is nothing special regarding Thomas Vermaelen. This is a normal process for a player who has been injured for a long time.
"He was injured all last season. He's recovering. But everything cannot happen quickly. The player was the first to suffer from this situation.
"He is doing specific training because his recovery is not necessarily going as planned."
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