The Seadogs thought their time in the competition was over after their 5-2 replay defeat last month.
But after admitting fielding an ineligible player, the League Two club were told they wouldn’t be removed. No details on the player being investigated have yet been disclosed.
Scarborough get to welcome Rovers on Tuesday December 12, where they were minutes from upsetting the EFL side in the first round.
Blackpool will host the eventual winners with an away game at Premier League Nottingham Forest on offer in round three.
An FA statement read. “A Professional Game Board Sub-Committee has ordered the Emirates FA Cup First Round Proper tie between Forest Green Rovers and Scarborough Athletic to be replayed on Tuesday 12 December at 19:45.
“The FA charged Forest Green Rovers for fielding an ineligible player in the Emirates FA Cup First Round Proper tie against Scarborough Athletic, which constitutes a breach of FA Cup Rule 109, and Forest Green Rovers subsequently admitted this charge.
“Forest Green Rovers will now play away to Scarborough Athletic in a one-off match on Tuesday 12 December, and the winner will travel away to Blackpool for a Second Round Proper match on Tuesday 19 December.”