Russell Martin has been told he has no choice but to change his tactics if he wants to keep his job at Leicester City.Martin‘s side were beaten 3-1 at home by Peterborough United on Saturday, dropping down to 17th in League One.Leicester boss Martin is under huge pressure after losing another game in League One on SaturdayGettyThe Foxes, who have only won two of their opening eight games in the third tier, were three goals down at half time.It was another miserable afternoon at the King Power Stadium, with Martin now under huge pressure to turn things around. talkSPORT understands the latest Leicester loss leaves manager Martin’s future in serious danger.In 12 games as Foxes boss, he’s won four, lost five and drawn three, with his side scoring 19 goals and conceding 20.But he continues to persist with his possession-based tactics, encouraging plenty of passing from his players, with Leicester ending Saturday’s defeat with 70 per cent of the ball.And former Chelsea striker Tony Cascarino believes that stubbon approach is likely to end end up being his downfall.What has Cascarino said on Leicester?Cascarino heaped praise onto Peterborough manager and former Leicester player Robbie Savage, who won his first League One match in charge of Posh in impressive fashion.But he quickly turned his attentions to Martin and his precarious situation in the hotseat at the King Power Stadium.Cascarino said on talkSPORT’s Weekend Sports Breakfast: “That’s his first match, being a former Leicester player himself, Robbie, and he wins the game away.“It’s a big result for him and Peterborough, but Leicester, well, it’s doomsday at Leicester, it really is. Whatever is happening at that football club…”Leicester are 17th in League One after losing to Savage’s Peterborough, who were 3-0 up at half time at the King Power StadiumGettyHe continued: “Leicester had loads more passes as you’d expect, but the bottom line is, the same argument is always being made.“And Martin can come out and say nothing’s going to change with a new manager. “Well, it will change, he will lose his job if he can’t find results.”Can Martin turn things around?Cascarino then went on to discuss where he thinks Martin is going wrong, pointing further at his stubborn tactics.He remarked: “You can play whatever way you want, whatever style you want, but if you’re losing games, then why you do coaching badges is to adapt, sometimes you have to do things you might not like.“You might not think this is my tactic, but this is the right thing for the team – at the moment, they’re losing a lot of football matches.”Cascarino thinks the only way Martin can save himself if to switch up his tactics as they’re not currently bringing resultsGettyHe was then asked whether he think Martin can turn it around, but he only thinks the Foxes boss can if he changes his ways.“You have to be a coach,” Cascarino began. “All the manager’s I’ve known, if you can’t see that your team are not capable of playing a certain way or it doesn’t suit them, then you have to change. “That’s your job as a coach, you have to find a way of winning, and at the moment, they can’t.”Leicester will hope for a better result next Saturday against Doncaster Rovers before a trip to Bromley follows three days later.If they continue to struggle, then the writing may be on the wall for Martin in the coming weeks.