It was fantastic to see Joe Hart back at Celtic Park on Sunday as he returned to the club as a guest to watch the derby against Rangers. Supporters at the stadium were delighted to see the iconic goalkeeper before the match, a good omen ahead of thrashing Philippe Clement’s dire outfit 3-0 in the Scottish Premiership. However, what you may have missed if you were in attendance and not watching on TV was Hart’s moment with his former Celtic teammates in the tunnel before kick-off. Sky Sports captured him firing up the match squad as they returned to the dressing room from their pre-match warmup…