According to The Sun, Celtic manager Ronny Deila will be looking for a left back, a central midfielder and a striker this summer.
The Bhoys managed to win the Scottish Premiership and the Scottish League Cup in Deila's first season in charge, but with Champions League qualification, Deila will be looking for more additions this summer.
The Sun report that Manchester City defender Dedryck Boyata is set to complete his move to Celtic in the next 24 hours having travelled to Glasgow to complete a medical, and whilst the Belgian will help ease the blow of losing Jason Denayer at the end of his loan deal from City, it's believed that the Norwegian is still looking for more additions.
The report suggests that Deila is still battling with Ajax for the signature of Willem II left back Mitchell Dijks, with cover for first choice left back Emilio Izaguirre needed.
Another position of concern for Deila is central midfield, with Celtic possibly needing more options behind the likes of Scott Brown, Nir Bitton and Stefan Johansen - despite Charlie Mulgrew's return from injury in recent weeks.
Finally, the last position Deila wants to strengthen is in attack, with John Guidetti's loan stay from Manchester City set to end in the coming weeks.
Leigh Griffiths has been sensational in 2015 but Stefan Scepovic has made little impact since arriving last summer, leaving Deila with few options in attack ahead of next season.
It would be little surprise to see Celtic add another winger considering the poor displays by loanees Aleksandar Tonev and Mubarak Wakaso this season, but it seems that Deila has prioritised three positions that need addressing after Boyata's arrival this week.