According to MD, if Masip does not continue, there will not be a third goalkeeper
Luis Enrique has always said that he has three high quality goalkeepers, but in the end only Ter Stegen and Claudio Bravo play. Jordi Masip only played two matches last season and this season he hasn't had any chances yet.
Masip finishes his contract in June 2017. According to Mundo Deportivo, Robert Fernandez thinks that if he doesn't continue next season, as he may want to play somewhere else, there will not be a third goalkeeper in Barcelona's first team.
In that case, if Bravo or Ter Stegen get injured, Luis Enrique could use one of Barcelona B goalkeepers: Ortolà, Ondoa, José Aurelio Suárez or Jokin Ezkieta, but they won't have a first team contract.