Paul Pogba “should be one of the best players in the world”, says Lee Sharpe, with the Manchester United midfielder falling short of that level as “his standard has not been good enough”.Consistency has been an issue for the France international throughout a second spell at Old Trafford.He returned to England in the summer of 2016, with Jose Mourinho breaking United’s transfer record when completing an £89 million ($114m) deal. Article continues below Editors’ Picks Man Utd ready to spend big on Sancho and Haaland in January Who is Marcus Thuram? Lilian’s son who is top of the Bundesliga with Borussia Monchengladbach Brazil, beware! Messi and Argentina out for revenge after Copa controversy Best player in MLS? Zlatan wasn’t even the best player in LA! Pogba, who is now 25 years of age, was expected to reach his peak with the Red Devils after establishing himself as a global star at Juventus.He has, however, often failed to deliver – despite now being a World Cup winner – and Sharpe believes there is no way he can be placed alongside the finest talent on the planet.The former United winger told talkSPORT : “His standard has not been good enough has it.<script src=”//nba.sportingnews.com/assets/js/standalone/iframe-resize.js”></script>“We’ve seen the standard he has set for France, the guy is 6 ft 4in and he can do everything in a football match, but he doesn’t produce it often enough in a red shirt.“We don’t know what’s going on behind closed doors properly, we don’t know what he’s been told or what his direction from the manager is.“But he’s certainly not producing what he can do, week-in, week-out.“He should be one of the best players in the world and turning it on every week.“But, for some reason he’s not.”Pogba’s performances for France over the summer, as they swept to global glory in Russia, showed what he is capable of when playing with freedom and confidence.A return to Old Trafford has seen him caught up in another storm regarding a supposed breakdown in his working relationship with Jose Mourinho .That saga is providing an unfortunate backdrop for United in 2018-19, with a stuttering start to the new season seeing them struggle to convince when beating Leicester and losing to Brighton – with Pogba having been on target from the penalty spot in both of those games.