Robbie Savage enjoyed a stunning EFL debut as Peterborough United manager to pile further misery on Leicester City.Posh, who started the match 23rd in League One, looked anything but a relegation-threatened side as they swept aside Leicester 3-1 at the King Power Stadium.Leicester’s season went from bad to worse at the hands of a former playerGettytalkSPORT understands Saturday’s defeat leaves Leicester boss Russell Martin’s future in serious danger.Martin’s counterpart Savage was appointed Peterborough boss earlier this month but had had to wait for his first taste of league action.And it was well worth the wait for the travelling Posh fans who watched on as Owira Edwards fired them in front after just 12 minutes.There was more to come as Harry Leonard took full advantage of a defensive mix-up to fire his side into a two-goals lead.With Leicester now on the ropes, Savage’s men went for the jugular and an unfortunate deflection from Foxes defender Warren O’Hora handed Posh a 3-0 lead going into the break.Leicester did pull one back in the second half through Emil Riis, but it was a case of too little too late for the rapidly decaying Foxes who are showing no signs of progression under Martin.As had been the case in previous games, the atmosphere at the King Power Stadium quickly turned ugly.Much of the disdain was again aimed at boss Martin who has now picked up just nine points from a possible 24.The defeat heaped further pressure on the former Southampton and Rangers boss who is yet to win over the club’s supporters.Fan disgruntlement towards the 40-year-old stem from his possession-hungry style of play.Things go from bad to worse for Russell Martin at LeicesterGettyHis method has created much debate since his arrival with many believing his style is both not fit for the rigours of League One and for the players at his disposal.And it didn’t take long for Leicester fans to show their disapproval with the all-too familiar chant of ‘Russell Martin, your football is s***.’Martin has now overseen three home league defeats including a brutal 4-0 thumping at home to Oxford last month.The Leicester boss later insisted the bruising defeat was merely an anomaly after former Foxes star Matt Piper had labelled it ‘a sackable offence’.“I’m not concerned about that happening again,” Martin previously said only to see his side put in a similar performance just five weeks later.Martin has continued to stick to his philosophy in the face of much public criticism.Following the midweek defeat at Stevenage, Martin was filmed interacting with a concerned Leicester fan where he defended the team’s style of play, pointing to his side’s 135 shots on goal in the last five matches.Savage by name, Savage by natureBut the day belonged to former Leicester midfielder Savage who has made a blistering start to life at Peterborough.The early signs show that Savage has brought back a strong attacking identity in his side.Posh scored four times in less than 10 minutes in Savage’s first game in charge, a 4-1 victory over Ipswich Town in the EFL Trophy. Three further goals at the King Power Stadium are encouraging signs for Peterborough fans as they aim to steer clear of the drop zone.