Barnsley sign QPR left-back Cole Kpekawa for an undisclosed fee, plus Wigan's Sam Morsy and Celtic's Saidy Janko on loan.
Motherwell sign West Ham United winger Luka Belic on an initial six-month loan deal.
PHILIPPE SENDEROS is on a mission to topple Celtic as champions.
Jozo Simunovic and Efe Ambrose remain Celtic players after transfers to Torino and Standard Liege respectively fall through.
Oxford sign Motherwell winger Marvin Johnson for an undisclosed fee and Chesterfield's Charlie Raglan on loan until January.
Fulham midfielder Larnell Cole has joined Inverness Caledonian Thistle on loan until January.
Ross County defender Scott Boyd becomes Kilmarnock's 16th summer signing, moving on a season-long loan.
Norwich City send James Maddison on loan to Aberdeen eight months after signing the midfielder for £6m from Coventry City.