After clinching their fifth successive Scottish Premiership crown, Celtic will be looking to add more quality to their squad this summer and extend their dominant streak once more next season.
Martin O’Neill’s side were struggling for form heading into 2026, but after welcoming the 74-year-old back to the helm in January, the Bhoys went on a relentless streak and eventually pipped Hearts to the title on the final day of the season.
With the 2025-26 league season being the most tightly contested Scottish top-flight year in recent history, Celtic will undoubtedly be looking to recruit well this summer in order to rebuild their buffer at the top next campaign
Here, Sports Mole rounds up all of Celtic’s confirmed ins and outs during the 2026 summer transfer window, as well as looking at their net spend and latest transfer rumours.
The summer transfer window opened on Monday, June 15 for all Scottish Premiership clubs, and will run through to the third day of September.
This means that deadline day for the 2026 summer transfer window falls on Thursday, September 3, with the window closing at 5pm GMT.
The Parkhead outfit have signed Julian Araujo and Tomas Cvancara – both on loan – in the winter transfer window from Bournemouth and Borussia Monchengladbach, respectively.
Supporters have consistently criticised a perceived lack of investment this season, while last summer’s recruitment has been hit and miss at best.
Benjamin Nygren is Celtic’s leading scorer – the Swede took his tally to 15 with the second against Falkirk – but Michel-Ange Balikwisha and Sebastian Tounekti have flattered to deceive.
Free signing Kelechi Iheanacho has struggled for both form and fitness, and although Kieran Tierney has impressed at points, he is not the same player that left for Arsenal in 2019.
The victory over Falkirk took O’Neill’s side back into second after Rangers were held by Hibernian, but they still trail leaders Hearts by six points.
