Neil Warnock says using John Stones as a makeshift right-back could be the solution to stabilising England’s back four.The Three Lions looked defensively suspect in three of their four World Cup matches with head coach Thomas Tuchel yet to find the right quartet.John Stones has been touted as a possible option for England at right-back in the absence of Reece JamesGettyEngland’s backline looked particularly shaky during Wednesday’s tense 2-1 win over DR Congo.The right-back position is one that has garnered most attention and more so following Reece James’ injury.The Chelsea skipper started England’s first two matches but since being sidelined with a hamstring issue, the position has been shared by Jarell Quansah and Djed Spence.Neither player has been able to stake a claim to succeed James for the rest of the tournament with the right-back berth very much up for grabs ahead of Sunday night’s clash against Mexico.Warnock, who took charge of 20 different clubs during a staggering 46-year managerial career, believes England’s defensive line will be crucial in how far they go at the World Cup.And he says Stones would provide the perfect replacement for James ahead of the last-16 clash at the Azteca Stadium.Defence is key“I think it’s all going to come down to how the back four do,” Warnock told talkSPORT.“When you look at the top sides, the back four that played (for England) the other day were poor.“I think they’ll have to step up. I look at [Marc] Guehi and [Ezri] Konsa and I like [Nico] O’Reilly.“It’ll be interesting to see who he plays at right-back. Personally, I think he might play Quansah there.”Spence was given the nod against DR Congo but was unable to show his best levelGettyAsked who he would play at right-back, he said: “I‘d play John Stones there.”Stones is no stranger to the position having featured there 65 times in his career, scoring three times and registering one assist.If Warnock was to get his way it would see Spence dropped to the bench immediately after his starting role in the win over DR Congo.Warnock knows Spence well from their time together at Middlesbrough however the pair became embroiled in a public spat when the legendary boss hit out at the star’s attitude.Mistakes made?Despite the ongoing furore around the omission of Trent Alexander-Arnold among other big names that were left out of Tuchel’s squad, Warnock stopped short of saying the German made blunders with his squad choices.“I think whatever squad he picks is going to be questioned by certain people. You can never please everybody as a manager, Warnock added.Neil Warnock has put forward John Stones’ name to fill the right-back voidYouTube/talkSPORT“He’s got to believe in what he thinks. He’s seen the dressing room and he’s decided to leave one or two people out.“Luke Shaw for me, at the end of the season I thought he warranted a position,“But he’s (Tuchel) seen something else and you’ve got to go with him really. He’s a top manager.”Asked if he’d have taken Alexander-Arnold in the 26-man squad, Warnock said: “I’m not 100 per cent sure about that. I think we need a good defender, that’s what I think.“I think we’ve got the best midfield in the whole tournament.“{Elliot] Anderson, that ball through to [Jude] Bellingham for the second goal (against DR Congo).Tuchel made some huge calls with his squad selectionGetty“That’s what we’ve got to do at altitude. We’ve got to have a pass going forward breaking the lines, not passing sideways like a lot of the teams are doing.“And Anderson just gave us that. Bellingham, he’s on fire again.“I like [Anthony] Gordon starting. I don’t think people realise he had a full-back against him that just man-marked him.“And we’ve got the best striker (Harry Kane) going, his second goal was wow.”