Newcastle director of football Joe Kinnear has heavily criticised club legend Alan Shearer as the fall-out from his appointment continues.
Kinnear, who was controversially hired last week, hit back at club record goalscorer Shearer after he branded the club a 'laughing stock'.
Shearer was Newcastle manager for the final eight games of the 2008-09 campaign in which the club was relegated from the Premier League after Kinnear had been forced to step away due to health issues.
The 42-year-old also claimed that Kinnear's appointment undermined the authority of manager Alan Pardew.
Kinnear has been quick to respond, slamming the former England international's knowledge of the game.
"What Shearer says is diabolical," Kinnear told The Sunday Times.
"This is a guy who hasn't got a clue about coaching.
"Shearer keeps slagging me off. He is being disrespectful to me. I am entitled to fight back."
Kinnear had previously asserted that he had 'more intelligence' than the Newcastle fans in a series of TV and radio interviews.
The former Wimbledon boss admitted he regrets that remark, and issued an apology to the supporters.
"I regret what I said about the supporters," he added.
"I can't get anybody to say that Joe has the utmost respect for the supporters and they are the most important people at the club.
"There are 10% I'm never going to win over, that is the point I was trying to make, but I regret what I said and if I offended any Newcastle fans I apologise."
Speculation has been rife that both Pardew and chief scout Graham Carr could leave the club over concerns about Kinnear's influence.
However, Kinnear has insisted he would not be involved with the first team.
"I will have the job of overlooking the reserves and the youth team and see where we are progressing, as well as being chief advisor to (chairman) Mike Ashley," he explained.
"I am not after his (Pardew) job. Alan knew there was a director of football coming in. He felt a little isolated and Mike sussed that."
|Zouma seals long-term Chelsea contract extension and Stoke loan|
|Inter 1 Schalke 1: Murillo hits stunning equaliser as Perisic makes appearance|
|Cahill: Terry is a huge loss for Chelsea|
|Newcastle seal Manquillo signing|
|LaLiga fixtures: Atletico Madrid start with three away games|
|LaLiga fixtures: Madrid to juggle Clasico plans with Club World Cup commitments|
|LaLiga fixtures: Barcelona host late-season Clasico|
|LaLiga key fixtures: Clasico on December 20, Madrid derby after World Cup play-offs|
|Conte declares Costa saga ´closed´, suggests decision to sell was made in January|
|LaLiga fixtures: Madrid travel to Deportivo on opening weekend as Barcelona host Betis|
|Benteke ´very happy´ at Crystal Palace amid Everton links|
|Conte: Morata was my first choice for Chelsea|
|Schar ends Hoffenheim troubles with Deportivo switch|
|Bonucci, Biglia and Mr X? Fassone teases on Milan transfer target|
|Ronaldo staying at Madrid and that´s it - Zidane|
|Kolarov close to Roma move as Guardiola hails City debutant Foden|
|Klopp insists Coutinho is going nowhere amid Barcelona interest|
|Shakespeare confirms Leicester rejected Roma bid for Mahrez|
|Mourinho: Manchester United need to sign more players|
|Neymar ´very happy´ to stay at Barcelona, says Roberto|
|Barca star Neymar teases fans amid PSG speculation|
|Mexico 1 Honduras 0: Defending champions into semi-finals again|
|Manchester United 2 Manchester City 0: Lukaku scores again in ICC derby|
|Jamaica 2 Canada 1: Reigning Gold Cup runners-up reach semis|
|Ceballos: I want to be like Modric, Kroos|
|Man United target Aurier wants to leave PSG – Emery|
|Ibrahimovic sends message to Man United as he steps up recovery|
|RB Leipzig ´lucky´ with Keita, says Klopp|
|Torino don´t want to sell Belotti as Vieri urges striker to join Milan|
|Donnarumma trying to imitate Bayern´s Neuer|
|Carrick backs Pogba for United captaincy|
|Zidane lauds talented Mbappe as Madrid circle Monaco star|
|Everton, Zenit and PSV learn Europa League opponents as Galatasaray suffer shock exit|
|Africa Cup of Nations expanded and moved to June and July|
|Cillessen happy at Barcelona and denies Crystal Palace links|
|RFEF president Villar held in custody amid corruption case|
|Bonucci aims to follow AC Milan legends Baresi, Costacurta, Maldini|
|DFB punishes Borussia Dortmund over crowd disorder|
|Neymar not for sale - Bartomeu gives FFP warning to PSG|
|Griffiths given Champions League ban over Linfield incident|
|Real Madrid places up for grabs - Bale|
|BREAKING NEWS: Hernandez set to join West Ham from Leverkusen|
|Bernardeschi misses Fiorentina training camp amid Juventus move reports|
|Monaco warn clubs over illegal Mbappe approaches|
|Hughton ´very hopeful´ over Knockaert injury|
|Morata perfect for Premier League but Lukaku has advantage - Karanka|
|Whelan ends nine-year Stoke City stay by joining Aston Villa|
|Hoeness tells Sammer to ´say little´ about Bayern|
|Altidore´s girlfriend: Only I can grab Jozy´s nipples!|
|Perisic to play on Inter tour as Manchester United bid stalls|
|Defrel reunited with Di Francesco at Roma|
|Bonucci and Ramos best in the world, says Milan boss Montella|
|Injured Thiago out of Bayern pre-season tour|
|Klopp helped me a lot - Liverpool captain Henderson reflects on injury woe|
|Rashford: Lukaku partnership could fire Man Utd to glory|
|De Sciglio completes €12m Juventus switch|
|Insigne eyes Scudetto success... and the tattoo to match|
|Mourinho: Manchester United can´t compete with clubs who buy and buy and buy|
|Lewandowski happy to see Aubameyang stay at Dortmund|
|Morata: Conte has shown the most faith in me|
|Neymar signing ´would be good´ for PSG, says Silva|
|Chelsea eyeing all titles this season - Kante|
|Neymar could make PSG Champions League contenders - Emery|
|MLS Review: Red Bulls put five past Earthquakes, Sounders rally from 3-0 down|
|PSG target Neymar and Barca arrive in New York|
|Morata says goodbye to Real Madrid ahead of Chelsea move|
|Mourinho unfazed by Morata´s Chelsea move|
|United States 2 El Salvador 0: Hosts advance to Gold Cup semis|
|Roma 1 Paris Saint-Germain 1 (3-5 pens): Alves makes debut in win|
|Rummenigge names Sanches price as he doubts Milan can meet Bayern demands|
|Messi a machine built for football – Xavi|
|Costa Rica 1 Panama 0: Godoy own goal the difference|
|Kompany: Man Utd star Lukaku believes he´s best in the world|
|Mourinho: Guardiola rivalry has eased|
|Lennon steps up Everton return with goal in Twente friendly|
|Morata ´very happy´ as Chelsea move nears|
|Verratti drops agent for Raiola after ´prisoner´ comments|
|Celtic 4 Linfield 0 (6-0 agg): Plain sailing as Sinclair scores twice|
|He´d still be running now if we didn´t take him off! - Klopp impressed by Salah energy|
|Sammer not convinced by ´limited´ James|
|Morata ready to be Chelsea´s main man? Spain star compared to Costa and Lukaku|
|Aguero going nowhere as Guardiola cools Sanchez talk|
|Manchester derby gets worker bee emoji in tribute to terror victims|
|Chelsea agree terms with Madrid on Morata deal|
|Barkley set to miss season opener after surgery|
|Southampton goalkeeper Forster signs new long-term contract|
|Guardiola confirms Manchester City´s Danilo interest|
|Adrian sends Sullivan reminder after West Ham chairman´s gushing Hart comments|
|Liverpool 2 Crystal Palace 0: Solanke and Origi on target in Hong Kong|
|Murphy completes move to boyhood club Newcastle|
|Bayern Munich 1 Arsenal 1 (2-3 pens): Cech and Martinez the heroes in shoot-out win|
|Szczesny completes €12.2m Juventus move|
|AC Milan did not respect Dortmund over Aubameyang, says Watzke|
|Great in the air, will Crouch be a hit on-air?|
|Atletico guarded over Costa bid|
|Del Piero backs Juventus to respond to Bonucci loss|
|Jakupovic joins Hull exodus to seal Leicester deal|
|Mourinho unsatisfied with Manchester United transfer business|
|Barcelona have been sleeping, warns Xavi|
|De Sciglio finalising Juventus move|
|Roma eye Mahrez as Salah replacement|
|€75m? No way! Leipzig reject huge bid for Liverpool target Keita|
|Matic closer to Manchester United move after Chelsea tour snub|
|Lukaku: Mourinho has already made me a better player|
|Mourinho wants 15 more years at United|
|Wijnaldum confident Liverpool can challenge for title|
|Conte´s non-extension the latest twist in Chelsea´s stuttering close-season|
|Hammered at Arsenal and destroying Man United - five key games in Chelsea´s title triumph|
|Masterful tactics, signing Kante and Moses´ reinvention: How Antonio Conte won Chelsea the Premier L|