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Published 18:25 23 Feb 2016 GMT
Updated 13:38 25 Feb 2016 GMT
Dos Anjos continued to spar after sustaining the injury but, after waiting for improvements over the weekend, the swelling didn't go down and the fracture was confirmed on Monday.
Dos Anjos' manager Ali Abdelaziz told Yahoo Sports' Kevin Iole that the Brazilian would be sidelined for around six weeks in total.