The front page of the DBacks wbsite is about Mantei's problem.....It basicslly says time is running out for Mantei to get healthy b4 the seasob starts and that the staff has tried everything.
It looks to me like Mantei is going to start the season on the DL, and Valverde will start the year closing. I don't know if I would pick Valverde up just yet, unless you have room. The only problem is just like last season, valverde will be lights out then Mantei will come back and Arizona will hand him his job back.
Assuming Valverde starts the season as Dbacks closer, he should rack up some saves b4 mantei gets back.