http://www.arsenal.com/news/news-archive/20151022/team-news-ramsey-ospina-wilshere So basically a month then. Considering it is a hamstring for Ramsey, a month is not too bad, sometimes you could really bad hamstring injuries that keep you out for 3 months. As for Ospina, he does seem to be really injury prone for a GK, he's been out quite a few times for us now, long term as well, with injuries. Can't say Ill miss him though considering that nightmare he produced VS Olympiakos.
Personally I think Ospina is a loss - yes he played very poorly in both CL games, but this is a keeper who'd won the no.1 shirt last season, and it would have been good to play in him our cup games, allowing him to gain some confidence, and enabling us to trust him in the Prem and/or CL if anything happened to Cech. Now Cech isn't going to get a rest during the early cup games, and we haven't got as good a cover for him, in case anything happens. Worried about Ramsey as hamstrings can be dodgy things, and when he's had them before they've supposed to be short term, then turn into medium term ones, then he comes back and has a set back then he's out for half a season! But fingers crossed this is a short term thing and he'll be raring to go in a month!
Ox is a bit unreliable as of late but a run of games could see him hit his stride. Plus I'm liking the competition between Theo and Giroud for striker atm so wouldn't change that.
TBH doesn't say much when he took that spot from Shezny, who himself has been just about average for a while. Once Cech came in, you can truly see the gulf in class with a world class GK, and Ospina. No doubt put Ospina beside Shezny, and yeah Ospina looks good.