Posh revealed on Thursday that Christy Pym has torn a muscle in his side, picking up the injury prior to Sunderland scoring the equaliser. The injury will see the goalie out for the rest of the season and has raised questions about the options for the final seven games of the season, beginning with the away tie at Swindon Town on Saturday.
Boss Darren Ferguson said: "It is a big blow, the boy has been very consistent over the last two seasons, but we have to get on with it, these things happen in football.
"The boy did ever so well to finish the game against Sunderland, he was struggling and when you see the extent of the injury you can see why. He is going to be out between four and six weeks and I have now got to look at my options and one of those would be an emergency loan.
"That is not because I don’t have any doubts about the other two goalkeepers I have got, but the facts are at this stage of the season, they don’t have the experience of playing enough league games. At any other point in the season, I would have no hesitation, but I will speak to them and we will look at our options.
"It is a blow for the boy and when you have a settled back five or six, the players have a great understanding so if we do bring someone in, it will need to be someone that has played in this league and fits how we want to play and if we can do that then great."
Neither of Posh's two reserve keepers, Daniel Gyollai and Will Blackmore, have been tested in the league.
With seven games to play, Peterborough United are second in the table, three points behind but with a game in hand over first-placed Hull City. Third-placed Sunderland, who took a point from the match at the Weston Homes Stadium on Easter Monday, are two points behind and have a game in hand over Posh, promising a tight battle for the automatic promotion places.