Lisandro Lopez (an Argie) or Jardel (Brazil) have been his primary replacements. Meh.
As far as Sporting goes, they started the season a bit rockier but are settling in. They need to tighten their defense more. And their CL campaign is done, especially since they got robbed by the ref against Schalke. That should give them more domestic focus.
My suspicion is they won't do as well this year... balancing the books on their tight budget plus they're trying to fund a replacement stadium. So Wilson Eduardo, Piris, and Marcos Rojo (not that great, IMO -- I like Cedric better) are all out. But they held on to William Carvalho. The Scots are probably jazzed that they signed Ryan Gauld: the 18-year-old "Scottish Messi"
Nani is a decent addition.
If they can get their defense in order, they could challenge. But a lot of draws already, and they're spilling goals where they used to be much tighter at the back.