Tom Poti will suit up for Washington against the Rangers Sunday if John Erskine is deemed unfit for duty. Erskine suffered an upper body injury Saturday in the first period against the Islanders. The Washington Post's Katie Carrera says it appeared to be to his "left hand or wrist." The rearguard played only two shifts, for a total of 1:18. Caps coach Adam Oates says Erskine is day-to-day.