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Celtic took full advantage of Hearts' slip at Hamilton to go top of the Premiership, while Aberdeen, Ross County and Motherwell all won.
Ronny Deila expects Virgil van Dijk to remain at Celtic, even if the club fail to qualify for the Champions League.
Hearts maintained their 100% Scottish Premiership record on Saturday, with Celtic, St Johnstone, Ross County, Hamilton and Aberdeen also winning.
St Mirren recruit Jamie Langfield on a two-year player/coach deal after he left Scottish Premiership side Aberdeen.
Goalkeeper Jamie Langfield is on the lookout for a new club after ending his deal at Aberdeen by mutual consent.