All summer offers from the second level

The summer transfer window opened on 14 June and will close at 11pm on 30 August.

Oxford United acted quickly, adding Sheffield Wednesday midfielder Will Vaulks and West Ham United goalkeeper Jacob Knightbridge.

See all the action below with our Sky Bet Championship transfer tracker.

Blackburn Rovers

Aodhan Doherty (Linfield, undisclosed)

City of Coventry

Raphael Borges Rodrigues (Macarthur, undisclosed)

Middlesbrough

Luke Ayling (Leeds United, free)

Delano Burgzorg (Mainz, undisclosed)

City of Norwich

Jose Cordoba (Levski Sofia, undisclosed)

OXFORD UNITED

Jacob Knightbridge (West Ham United, free)

Will Vaulks (Sheffield Wednesday, free)

Plymouth Argyle

Nathanael Ogbeta (Swansea City, free)

Portsmouth

Jordan Williams (Barnsley, free)

Sheffield Wednesday

Ben Hamer (Watford, free)

Max Lowe (Sheffield United, free)

Stoke City

Ben Gibson (Norwich City, free)

Viktor Johansson (Rotherham United, undisclosed)