Knicks big man Achiuwa out 2-4 weeks with strained hamstring

New York Knicks big man Precious Achiuwahas suffered a strained left hamstring and will be reevaluated in two to four weeks, the team announced Sunday.

It's unclear when Achiuwa, who has played in all five of the Knicks' preseason games, injured the hamstring.

The Knicks are already without center Mitchell Robinson to start the season as he rehabs from two ankle procedures over the past year. The Knicks are targeting January for a possible return date for Robinson, sources told ESPN's Shams Charania.

With centerIsaiah Hartensteindeparting in free agency, newly acquiredKarl-Anthony Towns and Jericho Simswill be the only healthy centers on guaranteed deals left on New York's roster when they open the regular season Tuesday against the Boston Celtics.