Hendriks (elbow) is scheduled to throw a bullpen session Monday, John Hickey of Bay Area News Group reports.
Hendriks has been playing catch in recent weeks as he returns from an elbow injury and is now ready to throw off a mound. If all goes well in his bullpen session, he'll likely pitch in batting practice or a simulated game and then prepare for a rehab assignment. Barring any setbacks, the 27-year-old is still aiming for a return to Oakland's bullpen sometime in mid-June.