Two victories apiece by Spurs and Celtic in the Madrid Cup league stages on Friday and Monday meant they finished strongly and join Whitedale in the last four.
Although losing their final game, Delting also sneaked a semi-final place by virtue of a better goal difference than Scalloway and Whalsay.
Meanwhile in the first leg of the Manson Cup, Whitedale had an important away victory over Scalloway.
Madrid Cup (league stages)
Celtic 2, Whalsay 1
Scorers for Celtic were Paul Leask and Tom Moncrieff. Whalsay replied through
Delting 0, Spurs 1
James Johnston grabbed the three points for the Milkbags.
Whitedale 0, Celtic 4
With Whitedale having already qualified for the semi-finals, they chose to have an off-night and Celtic certainly benefited. Goals from James Aitken, Roy Wood, Lowrie Simpson and a Greg Tulloch own-goal gave the Hoops a big win.
Spurs 6, Scalloway 2
Iain Goodlad, Connel Gresham (2), Jordan Webb, Dominic Mann and Shane
Jamieson netted for Spurs while the consolations for Scalloway came from a Josie Kay own goal and Rhydian Reynolds.
Manson Cup (first leg)
Scalloway 0, Whitedale 1
Jamie Wilson got the solitary goal for the away side.