Scottish Premiership rivals Hearts are on the hunt for a new manager after sacking ex-Rangers striker Steven Naismith. Naismith was sacked after a run of eight straight defeats which has the Tynecastle club 12th in the Scottish Premiership table and out of the Premier Sports Cup. Whilst there will be scant sympathy from Rangers given how Steven Naismith quit Ibrox, the sacking comes an interesting juncture in the Scottish league season. Hearts have comfortably been Scotland’s third force in recent campaigns and with a talented squad about to embark on an eight-game run in the Europa League Con…