Luton have signed former Peterborough and Brighton striker Craig Mackail-Smith on a two-year deal.
Loan pair Sam Hutchinson and Leon Best have extended their deals at Sheffield Wednesday.
Utility man Hutchinson, on loan from Chelsea, will remain at Hillsborough until April 9.
Meanwhile Blackburn forward Best, who has scored once in six matches, has signed until the end of the season.
Both players are available for Wednesday's clash with Birmingham on Saturday.