How Make an Vector Follow an Quaternion?

**I have a ray that rotates at all angles through the keyboard input my player looks all the time for the ball.
I need to do, the axis "X" and "Z" the vector of the player,
follow the Y-axis ray Quaternion
details:
I want to align the player in the direction of the ray when he's walking with the ball.

details code:
with this code I get the position and rotation of the player and I make it look at the ball

 void OnAnimatorMove(){
 
         newPos = anim.rootPosition;
         newRot= anim.rootRotation;
         //==========================================
         if (LookAt_Ball) {
         
         if( info.IsName("WalkBall") && Dist_Player_Ball >0.23
            || info.IsName("Stantard") && Dist_Player_Ball >0.23)
             {
             Quaternion rotPlayer = Quaternion.LookRotation(newPos - fisicaBola.ArmatureBola.position, Vector3.down);
             rotPlayer.x = 0.0F;
             rotPlayer.z = 0.0F;
             newRot = Quaternion.Slerp(newRot, rotPlayer, Time.deltaTime *speedLookAt);
             }
 
         if (vecAxisRef.magnitude != 1) vecAxisRef.Normalize();
         
         newPos.y = 0f;
         transform.position = newPos;
         transform.rotation= newRot;
         }
     }