Celtic eventually beat Rangers to the signing of the cultured play-maker.
Everton midfielder Tom Davies has started just five times so far this season.
Celtic ended their season with a 2-0 win over Hearts this afternoon.
Barton departed Rangers this week after playing just eight games for the club.
The 20-year-old will return to the Scottish Premiership side following Saturday's Scottish Cup final.
John Collins has touted Inverness boss John Hughes for the Celtic job.
The former Hoops assistant manager is certain the ex-Liverpool boss would be the perfect fit at Parkhead.
John Collins speaks highly of Celtic defender Kieran Tierney.
The Celtic striker has scored 40 goals in all competitions this season.
John Collins says that Celtic simply cannot sign Premier League players.
One player Celtic will not be looking to do a deal for is Aston Villa's Libor Kozak.
JPMorgan’s asset-management division has promoted James Peagam to head of global insurance solutions, an operation that oversees $78bn of client funds.
The Celtic assistant has been discussing his side's slow start to the season, echoing the exact thoughts of his manager.