Walker (finger) felt good following a five-inning simulated game Wednesday, Steve Gilbert of MLB.com reports.
The right-hander seems to be very close to amassing enough innings to rejoin the rotation, although the Diamondbacks are planning to re-evaluate Walker's status on Thursday. If he's deemed ready, he could rejoin the rotation as early as Tuesday, but if he can't look for Zack Godley and Randall Delgado to continue picking up starts in his place.