sentences:  In March 2016, Jaroslav Halák, the Islanders' starting goaltender, suffered a lower-body injury sidelining him six weeks, leaving Greiss as the team's temporary starter.In December 2016, the Islanders waived Halák, leaving Greiss and Jean-François Bérubé as the Islanders' two goaltenders.On 30 January 2017, Greiss signed a three-year contract extension with the Islanders.