Sources -- Warriors exploring options to trade Kristaps Porzingis - ESPN

The Golden State Warriors have begun exploring trade routes for veteran center Kristaps Porzingis, who remains out indefinitely as he deals with a private health issue that has him seriously contemplating his future in basketball, league sources told ESPN's Shams Charania.

Porzingis signed a two-year, $40 million extension with the team in June, but only $3 million of the $20 million in the second season is guaranteed, essentially making it an expiring contract. The front office strategically designed the extension without a raise between the two seasons, keeping him immediately trade-eligible instead of needing to wait until mid-December.

Despite the built-in flexibility, that wasn't the idealized intent of the contract. Porzingis played in 15 of the team's final 20 games last season and Warriors' management believed he had an encouraging enough summer to pencil Porzingis in as the projected starting center next to Draymond Green and rookie Yaxel Lendeborg in the frontcourt.

Porzingis was in the team's San Francisco facility and on the court in the week leading up to training camp and attended Jimmy Butler's player-led event in San Diego in late September, though team sources described a detached Porzingis as indifferent and uninterested in participating in scrimmages and strenuous on-court prep work at the event.

On the Sunday before training camp, Porzingis called the Warriors and alerted general manager Mike Dunleavy that he was still dealing with the lingering impact of a health issue that has bothered him for nearly two years and told them he would be taking an indefinite leave of absence.

Two seasons ago, Porzingis contracted an upper respiratory virus while playing for the Boston Celtics, and he has since vaguely