It follows their opening day defeat to Hearts in the Scottish Premiership.
Republic of Ireland midfielder James McCarthy has signed a four-year contract at Celtic.
The 30-year old was a free agent after his Crystal Palace contract expired.
Also joining Celtic today is former England and Manchester City goalkeeper Joe Hart.
📝 𝗗𝗢𝗨𝗕𝗟𝗘 𝗗𝗘𝗔𝗟! 😁💚
— Celtic Football Club (@CelticFC) August 3, 2021
Welcome to #CelticFC, Joe Hart and James McCarthy! 🍀#WelcomeHart 🤝 #WelcomeMcCarthy
Westmeath Manager Expects Two Point Onslaught In Wexford
Patchy Laois Wrap League Campaign Against Table Topping Down
Laois And Offaly Begin Minor Hurling Campaign
"Special Doesn't Do These Lads Justice"
Upwardly Mobile Athlone Take On Treaty
Ireland Name Nine New Caps For Six Nations Squad
Panthers Promotion Hopes Dashed On Final Weekend
Colaiste Mhuire Mullingar: All Ireland Champions
Dublin Sink Offaly In Camogie
Lowry Looks On Shaky Ground Since Cognizant Collapse
"Unhappy" Laois Leave Fermanagh With Some Regret
Laois Ladies Football Legend Honoured By County Council
Westmeath School Primed For All Ireland Final Shot
Offaly Relegated After Cavan Defeat
Offaly And Longford Chase Semi-Final Spot In Division Four
Gold Cup Takes Centre Stage On Final Day Of Cheltenham
Offaly TD Demands Stronger Ticket Touting Laws As Six Nations Prices Hit €3k
Offaly Travel To Dublin For Fourth Round Of National Camogie League
Athlone Town Get Title Defence Underway Tomorrow