The Derby cult hero is sad to see Marriott and the Rams struggle this term and sought to explain how he and the Pride Park side could both improve.
Derby County have failed to win their last four Championship games.
Jack Marriott scored his first goal of the new Championship season as Derby County lost 2-1 to Bristol City at Pride Park.
Derby County host Bristol City in the Championship on Tuesday.
The Derby forward has been compared to one-time Rams coach Phillips, who won the European Golden Shoe while at Sunderland.
The Rams played out a goalless draw with the Swans at Pride Park and Marriott only came on in the 80th minute.
Leeds United are on the look out for a new forward, and Derby County's Jack Marriott could be just what they are looking for.
The Rams striker - who didn't start in the Championship playoff final - scored a brace in Florida.
Kortney Hause is on loan at Aston Villa from Wolverhampton Wanderers, while Anwar El Ghazi is on loan from Lille.
Nottingham Forest feel that Martin O'Neill should move to attempt to sign Jack Marriott from Derby County this summer.
Rangers had a pretty busy transfer window with their standout purchase being winger Ryan Kent.
Leeds United signed Eddie Nketiah and Ben White on loan from Arsenal and Brighton and Hove Albion respectively in the summer transfer window.
Dele Alli endured a difficult night in his first start for Tottenham Hotspur this season, as Mauricio Pochettino's side let a two-goal lead slip against Olympiakos in the Champions League.
Chelsea midfielder Ross Barkley missed a crucial spot kick against Valencia, as Frank Lampard's side slipped to defeat.
Tottenham Hotspur attacker Erik Lamela failed to have the desired impact after being brought off the bench against Olympiacos.
Who is better right now? Manchester City's Premier League superstar Raheem Sterling or Liverpool's Egyptian King Mo Salah?
Tanguy Ndombele proved his worth in the Champions League with Lyon last season and now he will be hoping to replicate that form when he makes his European debut with Tottenham Hotspur on Wednesday night.
Fikayo Tomori made his Champions League debut for Frank Lampard's Blues but Rodrigo Moreno scored the winner at Stamford Bridge.
Liverpool lost 2-0 away at Napoli on Tuesday night.
Liverpool are currently five points clear at the top of the Premier League table, with Manchester City's injury crisis worsening.