Lavery's contract with the Blades bitter rivals Sheffield Wednesday expired in June.
Coutinho complained of a tight hamstring in last weekend's defeat to Burnley.
Southampton look set to break their transfer record.
The promising midfielder will be involved with the first-team.
Tottenham Hotspur made a bid for Wilfried Zaha yesterday.
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Sunderland have been linked with Brentford’s Scott Hogan and Oliver Burke of Nottingham Forest.
Ross McCormack speaks highly of Leeds United.
Wolverhampton Wanderers are reportedly keen on signing striker Mauricio Pinilla.
Tottenham Hotspur are interested in signing Wilfried Zaha from Crystal Palace in the summer transfer window.