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On paper what OGS and Lampard are trying to do are similar, bringing in the youth. Then when you look closer, Tammy, Tomori, Mount and Reece James have combine about 300 career club games away from Chelsea. United young players still at potty training level when it comes to experience.
Lampard got Derby playing well as well. Well enough to beat Man Utd at Old Trafford in 2018.
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It also looks like Mount and Tomori were both playing for Derby in that match which means that Lampard trusted them and helped their development along even while Derby were chasing promotion to the EPL.