The striker faces 3-4 weeks out due to injury.
Motta said: "Joshua is Joshua, we must not compare him with no one. I feel sorry for him, because it was a very positive period. The guys who can replace him are doing well, from Jens (Odgaard) to Santiago Castro who arrived here with great hunger."
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"I don't want anyone to try to get close to Joshua because everyone has his own characteristics.
"At the moment Odgaard can get close to him but he also has other particularities. Each of them must put their best version on the field for the team."