The Sharks are in discussions to re-sign pending unrestricted free agent goaltender Alex Stalock, his agent told on Thursday night. The discussions are a very strong indication that the Sharks will not bring back Thomas Greiss, who is also set to become an unrestricted free agent. Stalock, 25, served as the Sharks’ emergency goaltender during the Stanley Cup Playoffs and could be in line to become the backup to Antti Niemi in 2013-14. Drafted by the Sharks in the fourth round in 2005, Stalock made two appearances in 2013, coming on in relief of Niemi both times on March 9 and 16. He allowed two goals on 13 shots in 42 minutes, posting an 0-0-1 record. In 38 games with Worcester in 2012-13, Stalock was 17-16-4 with a 2.60 goals-against average and .912 save percentage. He split time with Harri Sateri, who could also challenge for the backup role in training camp. Sateri, a restricted free agent, was 15-20-1 in 38 games with Worcester, with a 2.86 GAA and .908 SP.