Rory Dunne suffered a dislocated ankle early in the second half and play was held up for over 10 minutes as he received treatment on the Irish TV Grounds pitch before being taken away by ambulance.
“He’s gone to the hospital and we’ll see when the x-ray comes back,” said Hyland. “It’s unfortunate because he was having a good game and he’s been having a good year for us. I would be afraid that it could be over for him at this stage.”
Dunne’s injury marred what was the perfect outing for a Cavan team still struggling to put their narrow loss to Monaghan behind them.
Barring a sluggish opening 10 minutes they completely bossed proceedings, with Niall McDermott kicking five first-half points as they led 0-11 to 0-4 at the interval after playing into the breeze.
The game was petering out when Dunne went down injured, but Cavan shifted up a gear when play got back under way.
Gearoid McKiernan was in unstoppable form, hitting an unanswered 1-3 during a three-minute scoring burst, with Dara McVeety adding a second goal on 62 minutes.
Hyland’s counterpart Paul Coggins kept his London players in a lengthy huddle after the final whistle. He has worked wonders during his five-year reign, leading the Exiles to a first ever Connacht final appearance in 2013, but this 17-point annihilation harks back to the bad old days.
This was the last inter-county match to be played at Ruislip before redevelopment work begins, but Coggins wouldn’t be drawn on whether it was his last game as manager. “It’s too early to say. It’s five years and I wouldn’t make a decision at this point. It wouldn’t be right.”
He added: “What did I say in the huddle? I was thanking the players for their efforts this year. I know it ended badly and none of us wanted it to end like that. I thought the performance in the second half was very good, we got right up there, I think there was five points in it at one stage. But you know that’s the sort of thing they can do.”
G McKiernan (1-6), D McVeety (1-2), N McDermott (0-5, 2 frees), T Corr (0-3), N Murray, E Reilly, C Mackey, M McKeever, M Reilly (free), R Galligan (45) (0-1 each).
L Mulvey (0-6, 4 frees), A O’Hara (0-3, 1 free), D McGreevy (0-1), L Gavigan (0-1).
R Galligan; J McLoughlin, R Dunne, K Clarke; C Brady, F Flanagan, D O’Reilly; T Corr, G McKiernan; D McVeety, N Murray, M Reilly; R Flanagan, M Argue, N McDermott.
C Mackey for Clarke (11), J McEnroe for Dunne (54), E Reilly for Flanagan (60), M McKeever for Brady (64), P Smith for M Reilly (64), K Brady for Murray (70).
D Traynor; B Collins, P Butler, S Curran; M McCoy, C Carty, D McGreevy; M Carroll, A Bradley; S Conroy, M Gottsche, C Og Greene; A O’Hara, L Mulvey, A Moyles.
N Boyle for Carty (16, black card), L Gavigan for Moyles (32), A Carr for O’Hara (44), C Sheridan for Conroy (60), A O’Regan for Bradley (62), S Devine for McCoy (64).
C McManus (Meath)