BRIAN O'Callaghan has left Halifax Town after a month after arriving from Cork City.
The centre back played just one league game for the Shaymen - away to Northwich.
"We had a look at Brian to see where he was and hope that there was a player," said boss Chris Wilder..
"We hope that a lot of things come right, but we need solid, consistent performers especially in the back four.
"We might have to restructure the way we look at things in terms of the activity in the transfer market.
"We might have to change from carrying 19 or 20 players and chop it down and go for a bit more quality."
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