Celtic wrapped up a domestic Treble for an unprecedented third straight season after beating Hearts 2-1 in the Scottish Cup final on Saturday.
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Hearts manager Craig Levein was taken to hospital on Monday morning but is recovering after receiving treatment, the club said.
Demetri Mitchell, 21, played 11 games for Hearts during the second half of last season after leaving Old Trafford on loan in January.
Moussa Dembele and Scott Sinclair ended Hearts' unbeaten home run as Celtic came from behind to win 3-1 at Tynecastle.
Rangers exorcised some of their Old Firm ghosts as they claimed a much-needed 2-1 win over Hearts at Ibrox.
Rangers closed to within six points of Premiership leaders Celtic with an impressive 2-0 win over Hearts at Ibrox.
Scottish football club Hearts have apologised to former player Isma Goncalves after he said racial abuse forced him to leave.
In an ESPN FC exclusive, Man United youngster Demetri Mitchell discusses his new position, current loan spell at Hearts and future at Old Trafford.
Hearts had ended the Hoops' 69-game unbeaten run with a 4-0 home win in December.