Brendan Rodgers has revealed Philippe Coutinho sent him a text message shortly before he completed his £142 million move to Barcelona.
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Celtic moved 11 points clear of Aberdeen at the top of the Scottish Premiership with a businesslike 2-0 Boxing Day win over Dundee at Dens Park.
Brighton are keen to sign Celtic striker Moussa Dembele, with the two clubs in talks over a move, though both have yet to agree a fee.
Celtic stretched their lead at the top of the Scottish Premiership to eight points with an emphatic 3-0 home win over second-placed Aberdeen.
Partick Thistle midfielder Gary Fraser has apologised for the "moment of madness" which saw him fire a ball into the Celtic Park crowd.
Celtic resumed normal service in the Scottish Premiership but only at half-throttle with a 2-0 win over Partick Thistle at Parkhead.
Defender Compper has signed a two-and-a-half year contract at Parkhead and officially joins on Jan. 1.
Brendan Rodgers revealed he called a huddle after Celtic's long unbeaten record ended in a 4-0 defeat by Hearts to remind them of their achievement.
Brendan Rodgers' Scottish champions were behind after 26 minutes when teenager Harry Cochrane fired home a low strike.
Hearts ended Celtic's 69-game unbeaten domestic run in stunning fashion with a 4-0 hammering of the Premiership champions.
France under-21 midfielder takes goal tally to five since joining from Manchester City in the summer.
Celtic extended their unbeaten domestic run to 69 games with a 3-1 win over Hamilton at Parkhead but it was far from a vintage performance.
Rodgers and Mancini will face each other in the Europa League after the draw pitted Celtic against Zenit St Petersburg.
Hibernian fought from two goals behind to grab a 2-2 draw in a pulsating Scottish Premiership encounter with leaders Celtic at Easter Road.
Celtic boss Brendan Rodgers' "immense pride" at qualifying for the Europa League was tempered by his side's 1-0 Champions League defeat to Anderlecht
Celtic will be playing European football after Christmas despite a 1-0 Champions League defeat by Anderlecht at Parkhead.
Odsonne Edouard grabbed a stunning hat trick as Celtic cruised to a 5-1 Scottish Premiership win over Motherwell at Parkhead.
Scott Sinclair's 88th minute penalty gave Celtic a dramatic 1-1 Premiership draw at Motherwell and extended the Hoops' unbeaten run to 66 games.
Celtic took the first step towards successive domestic trebles with a 2-0 Betfred Cup final win over 10-man Motherwell at Hampden Park.
Celtic's Moussa Dembele said Wednesday's Champions League encounter with Paris Saint-Germain had been "good for two minutes."