Hummel tells the Lafayette Journal and Courier he has agreed to a deal with El Obradoiro, which plays in Spain's top professional league.
He says the deal was made with the approval of the Timberwolves, who drafted Hummel 58th overall in June. Hummel says Minnesota has a lot of forwards on the roster, but believes the Timberwolves and the NBA are still in his future.
Hummel starred at Purdue and was considered its top player until tearing the ACL in his right knee twice in less than 12 months.
He finished ninth on the Boilermakers' career scoring list (1,772), fourth in rebounds (862), fourth in 3-pointers (216) and seventh in blocks (112).