Board Thread:Theories and Speculation/@comment-28819877-20170515143845/@comment-25122992-20170515151405

Thekillman wrote: Nope.

The condition is that you have Ashura's and Indra's chakra. So an Ashura taking some Indra flesh will also achieve it. Sharingan is not a requirement. Well, at least Sharingan is surely required, otherwise Naruto would've awakened his own Rinnegan after receiving Hagoromo's chakra had it been the only requiremed.