The phrase "keeper situation" refers to a specific situation or condition related to someone's role as a keeper. It implies a problem, circumstance, or dilemma that needs to be addressed or resolved. Full definition
To answer you question regarding the goal keeper situation if Mad Jens had seen red... RvP was quoted on the BBC as saying it would have been him (I do nt believe it but that would have made for a very interesting game!) (arsenalfcblog.com)
One cb, a dm player and forward thinking around our goal keeper situation is needed. (justarsenal.com)
An upgrade or back up to Rambo in CM seems more important as well as sorting out the back up keeper situation (Ospina - Szczesny) and sorting out Sanchez - Ozil - Ox - Wilshere contracts. (justarsenal.com)