Celtic have made an assertive start to their defence of the Scottish Premiership title but Martin O'Neill still expects to see several more new faces through the door at Celtic Park before the transfer window concludes.
The Bhoys secured a fifth successive Scottish Premiership crown by the skin of their teeth as they defeated Hearts on the final day of the season, and the club's hierarchy are determined to ensure they don't stagnate whilst rivals around them invest heavily into their playing squad.
Celtic have bid farewell to stalwart Daizen Maeda following his switch to Ipswich Town, while the likes of Kelechi Iheanacho and Luis Palma have departed Glasgow this summer.
The need for reinforcements at Celtic was evident and the club have started to take the handbrake off their spending, with the club splashing in excess of £20million on three players alone.
Every signing Celtic have made in the 2026/27 summer transfer window
- Kasper Høgh - Bodø/Glimt (€12.85m)
- Camilo Durán - Qarabağ (€5.5m)
- Haissem Hassan - Real Oviedo (€7.00m)
- Mika Baur - SC Paderborn (€6.30m)
- Oliver Sorensen - Parma (Loan)
- Sam Johnstone - Wolves (Loan)
- Shim Mheuka - Chelsea (Loan)
- Landon Emenalo - Chelsea (Loan)
- Joel van den Berg - PSV (€3.5m)
- Jordan Lotomba - Feyenoord (Free)
*Fees according to transfermarkt and excluding add-ons.
