The signing of the England international was announced in July and he has been out since the start of the year, due to an ankle injury and nerve damage in his neck.
It has been a long road to recovery for Cowan-Dickie but Sanderson believes he will make a full recovery.
"There was a concern medically because it was flagged by the Top 14 who have stricter protocols on neck injuries.
"I have some experience myself having retired from a similar type of injury. So I am aware of the knock-on effects and the chronic nature of discs in your neck slipping.
"We wouldn't look to endanger him and his health without doing all the due-diligence.
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