Saints star George North will start for Wales against France on Saturday.
North has not played since February 6, having sustained two hefty blows to the head in the Six Nations opening night defeat to England.
He had been undertaking concussion protocols, despite being symptom-free, and Saints boss Jim Mallinder had suggested he may play a part at Bath last weekend.
But the Welsh Rugby Union (WRU) neurologist advised North to take time out and he is now fit for the trip to Paris this weekend.
The Northampton juggernaut will become the youngest ever player to reach 50 Test caps at the age of 22.