How can you know, maybe he comes back stronger then he was, time will tell, and if he doesn't come back as strong as he was, then there is no way Lazio will want him.
In CL, we can use some experienced defenders, I don't see the point in paying that much + giving Andrade with it, Stendardo isn't that much better.
Then we can better invest in Zapata f.e.
Andrade played good in the matches he played before he got injured, I wouldn't know why we would have to get rid of him. If he can return to that form once he is back from his injury, I have no problems with him staying.