They images are too dark, underexposed. All of the detail in the jersey's is lost to shadow and the noise is made much worse by being underexposed.
I pulled the first image up in LR, and the brightest area of the white ice reads ~85% RGB. I pulled the image up one full stop and got the ice reading ~95%, which us where it should be. That shot was f/4, 1/400 and ISO3200.
Without changing equipment, that should should have been at least f/4, 1/400 and ISO6400, and since I think 1/400 is too slow I would have shot it at f/4, 1/800 and ISO 12800.
The faster 70-200/2.8 lens would obviously allow a correctly exposed shot at f/2.8, 1/800 and ISO6400.
I don't know if the 7D is manageable at that ISO level. I looked to use images to see how much I could do with noise reduction, but the athletes lack detail. I think the first shot is front focused, the last shot is back focused and the middle shot probably is just very soft due to motion blur. The last shot is the best of the bunch for having detail, so I brightened it and applied NR. Overall it clears up for the regular looking noise, but there are flecks of hot pink shot through the image. I've never experienced noise like that except when shooting long exposures (like, several hours) so I'm not sure if that is typical of the 7D or what.
Also, people will not be able to post edits to your shots unless you allow image editing.