The 2018 UK summer transfer window officially commenced on Monday the 2nd July and concluded at 5pm on Thursday the 9th August. Once again, a significant number of Irish players were released by their clubs. Top of the list of movements was the £4 million pound switch of Greg Cunningham from Preston North End to Cardiff City while recent Ireland debutant Graham Burke moved from Shamrock Rovers to Preston North End. Moving on free transfers were David Meyler from Hull City and John O’Shea from Sunderland, both to Reading. Defender John Egan joined Sheffield United from Brentford on a four year contract for an undisclosed fee. James McClean joined Stoke City from West Bromwich Albion also for an undisclosed fee and on deadline day, Harry Arter made a season long loan switch from AFC Bournemouth to Cardiff City.
| Name: | From: | To: | Details: |
|---|---|---|---|
| Harry Arter | AFC Bournemouth | Cardiff City | Season Loan |
| Shola Ayoola | Stoke City | Released | |
| Noe Baba | Macclesfield Town | Waterford | Released |
| Adam Barton | Partick Thistle | Dundee United | Undisclosed |
| James Berrett | Grimsby Town | Released | |
| Graham Burke | Shamrock Rovers | Preston North End | 3 year contract |
| Sam Byrne | Everton | Dundalk | Released |
| Niall Canavan | Rochdale | Plymouth Argyle | Free |
| Canice Carroll | Oxford United | Brentford | Undisclosed |
| Samir Carruthers | Sheffield United | Oxford United | Season Loan |
| Michael Collins | Bradford City | Head Coach | |
| Greg Cunningham | Preston North End | Cardiff City | £4m - 3 Yr Deal |
| Ronan Curtis | Derry City | Portsmouth | 2 year contract |
| Conor Davis | Reading | UCD | Released |
| Daniel Devine | Partick Thistle | Dunfermline Athletic | Released |
| Connor Dimaio | Chesterfield | Stockport County | Released |
| Colin Doyle | Bradford City | Released | |
| Eoin Doyle | Preston North End | Bradford City | 2 year contract |
| Aaron Drinan | Ipswich Town | Sutton United | Season Loan |
| Festy Ebosele | Bray Wanderers | Derby County | |
| John Egan | Brentford | Sheffield United | 3 year contract |
| James Finnerty | Aston Villa | Rochdale | 2 year contract |
| Willo Flood | Dundee United | Dunfermline Athletic | 1 year contract |
| Shane Flynn | Bray Wanderers | Leicester City | |
| Chris Forrester | Peterborough United | Aberdeen | 3 year contract |
| Rory Gaffney | Bristol Rovers | Salford City | Undisclosed |
| Darron Gibson | Unattached | Wigan Athletic | Short contract |
| Stephen Gleeson | Ipswich Town | Aberdeen | 2 year contract |
| Dale Gorman | Stevenage | Released | |
| Jamie Gray | Stevenage | Released | |
| Paul Green | Oldham Athletic | Crewe Alexandra | 1 Year contract |
| Reece Grego-Cox | Woking | Crawley Town | 2 year contract |
| Ben Heneghan | Sheffield United | Blackpool | Season Loan |
| Tommie Hoban | Watford | Aberdeen | Season Loan |
| Noel Hunt | Wigan Athletic | Waterford | Released |
| Des Hutchinson | Brighton & Hove Albion | Waterford | Released |
| Roland Idowu | Bray Wanderers | Southampton | |
| Stephen Ireland | Stoke City | Released | |
| Keith Keane | Rochdale | Released | |
| Graham Kelly | Port Vale | Released | |
| Fiacre Kelleher | Oxford United | Macclesfield Town | Season Loan |
| Sam Kelly | Grimsby Town | Hamilton Accedemicals | Free |
| Seamus Keogh | Sligo Rovers | Southampton | |
| Jack Larkin | Waterford | Glasgow Celtic | 3 year contract |
| Conor Levingston | Wolverhampton Wnds | Released | |
| Sean Long | Lincoln City | Cheltenham Town | Free |
| Joe Mason | Wolverhampton Wand | Colorado Rapids | 6 Month Loan |
| Liam McAlinden | Exeter City | Cheltenham Town | 2 year contract |
| Aaron McCarey | Ross County | Released | |
| James McClean | West Bromwich Albion | Stoke City | Undisclosed |
| Robbie McCourt | West Bromwich Albion | Released | |
| Donal McDermott | Swindon Town | Released | |
| Gerry McDonagh | Nottingham Forest | Barnsley | Released |
| Patrick McEleney | Oldham Athletic | Dundalk | 3 year contract |
| Sean McGinty | Torquay United | Partick Thistle | Undisclosed |
| David McGoldrick | Ipswich Town | Sheffield United | 1 year contract |
| Khius Metz | Burnley | Released | |
| David Meyler | Hull City | Reading | 2 year contract |
| Brendan Moloney | Northampton Town | Out of contract | |
| Frank Mulhern | Guiseley | Stockport County | Undisclosed |
| Jake Mulraney | Inverness CT | Heart of Midlothian | Undisclosed |
| Anthony O'Connor | Aberdeen | Bradford City | 3 year contract |
| Paudie O'Connor | Leeds United | Blackpool | Season Loan |
| Stephen O'Halloran | Stockport County | end of contract | |
| Dara O'Shea | West Bromwich Albion | Exeter City | Season Loan |
| John O'Shea | Sunderland | Reading | 1 year contract |
| John O'Sullivan | Carlisle United | Blackpool | Free |
| Rian O'Sullivan | Brighton & Hove Albion | Released | |
| Evan Pierce | West Bromwich Albion | Released | |
| Jean Yves Poame | Sunderland | Released | |
| Joe Quigley | AFC Bournemouth | Maidstone United | Released |
| Stephen Quinn | Reading | Released | |
| Callum Reilly | Bury | Gillingham | 2 year contract |
| Danny Rogers | Aberdeen | St Mirren | Season Loan |
| Adam Rooney | Aberdeen | Salford City | Undisclosed |
| Louis Rowe | Barnsley | Released | |
| Conor Sammon | Hearts | Motherwell | Season Loan |
| Ryan Scully | Partick Thistle | Greenock Morton | Released |
| John Sheridan | Carlisle United | Manager | |
| Connor Smith | Yeovil Town | Boreham Wood | Undisclosed |
| Anthony Stokes | Apollon Smyrni | Tractor Sazi (Iran) | Free |
| Ryan Sweeney | Stoke City | Mansfield Town | Season Loan |
| James Talbot | Sunderland | Released | |
| Michael Timlin | Southend United | Stevenage | Free |
| Dylan Watts | Leicester City | Released | |
| Marc Wilson | Sunderland | Bolton Wanderers | 1 year contract |