St Mirren have signed winger James Dayton from Oldham on loan until the end of the season.
Charlton have completed the signing of Belgium international Christophe Lepoint from Ghent for an undisclosed fee.
Lille midfielder Idrissa Gueye has agreed a three-year contract extension.
The 23-year-old Senegal international is now tied to the Ligue 1 club until the summer of 2018.
Gueye was a member of the Lille squad that won a league and cup double in 2011 and has made 80 league appearances since his debut in 2010.