Middlesbrough have signed Republic of Ireland goalkeeper Darren Randolph on a four-year deal.
Middlesbrough midfielder Cristhian Stuani has joined La Liga club Girona for an undisclosed fee.
Nottingham Forest have announced the signing of striker Daryl Murphy from Newcastle for an undisclosed fee.
Scotland international Robertson has signed a long-term contract and moves to Anfield for an undisclosed fee, reported to be around £10 million.
Aston Villa have signed veteran defender Chris Samba on a free transfer.
Chelsea goalkeeper Jamal Blackman is in line to join Bolton Wanderers on loan, sources close to the Premier League club have told ESPN FC.