In Orléans, after sending followers to the Beneficial Deeds board at the town hall, can they be re-recruited from the common pool back into the bag?

In the bag-building Euro classic *Orléans*: I sent a farmer and a knight to the Beneficial Deeds board at the town hall and took the corresponding coins and citizen tokens. Are these two followers permanently locked at the town hall, or can they later be bought back into my bag through the regular recruitment action?