Sheridan had goalkeeper Jake Cole to thank for the Pilgrims earning a replay and taking the tie back to Home Park as he produced two great saves to deny Nick Wright in either half at Sincil Bank.
Sheridan said: "It was a very tough game, they always are in the FA Cup when you are playing a non-league team. We have to make sure we get the job done at home now.
"Our 'keeper has made a good save but aside from that I always felt comfortable. I thought we played well, particularly in the second half - we certainly passed the ball better.
"Goals have been a problem for us but I do think we are creating chances and we'll just have to continue doing that in the coming weeks.
"Lincoln gave us a good game but I was just disappointed with us in the final third."