Linfield and Glentoran both look to be facing almost impossible missions in Monday's Setanta Cup quarter-finals second-leg ties in Belfast.
The Glens host League of Ireland champions Sligo Rovers at the Oval after taking a 5-0 first-leg drubbing.
The Blues are 4-1 down from the first leg and an already long injury list has been lengthened by Philip Lowry's absence for Monday's game.
Derry City face Drogheda United away after drawing 1-1 in the first leg.
The Candystripes go into the game after Friday's disappointing opening league defeat by champions Sligo.
Derry will welcome back Kevin Deery after suspension but Sean Houston, Paddy Kavanagh, Dermot McCaffrey and Stewart Greacen are all ruled out by injury.
Greacen sustained a knee injury in the first leg and could be out of action for up to two months.
For the Blues, Lowry, Gary Browne and Johnny Black are out because of injury while goalkeeper Alan Blayney is likely to miss the game because of a stomach virus.
In addition, Matthew Tipton is another injury doubt for the Blues.
SETANTA SPORTS CUP QUARTER-FINALS SECOND LEGS
Monday, 19:45 GMT
Drogheda Utd (1) v (1) Derry City
Glentoran (0) v (5) Sligo Rovers
Linfield (1) v (4) Shamrock Rovers