Perry signed with the Kings as a free agent last summer, but the 2011 NHL MVP injured his knee while skating before the start of training camp in September.
Jagr, whose 766 NHL goals rank him No. 4 all-time on that list, played 11 seasons in Pittsburgh, winning the Stanley Cup with the Penguins in 1991 and 1992.
Gadjovich has six goals and three assists in 84 games over parts of three seasons with the Panthers He also had two goals -- one of them against Toronto in a Game 7 win -- and an assist in last season's Stanley Cup playoffs.
Schaefer found a loose puck after a scramble in front of the net and lunged forward, poking it past Washington Capitals goalie Logan Thompson at 4:28 of the third period in the Islanders' 4-2 loss Saturday night.