Today's newspapers say that both are targets to sign before Saturday's match at Nottingham Forest, along with Crystal Palace's Neil Danns, who is believed to be Paulo Sousa's number one target.
Frecklington featured for Peterborough against the Swans on Saturday, and according to the Peterborough Evening Telegraph, is keen to make the move down to South Wales after hearing about the interest.
United midfielder Quinn scored at the Liberty earlier this season and has made over 30 appearances this season for the play-off chasing Blades, who are believed to be keen to keep hold of the youth product.
Sousa has a massive headache for Saturday's game with Darren Pratley and Ferrie Bodde added to the centre midfield injury list which already includes Andrea Orlandi, Joe Allen and Jordi Lopez, who is out for the rest of the seaason.
This article first appeared on JACKARMY.net.