In the last transfer window, Chelsea signed Jadon Sancho from Manchester United, bringing the winger in on loan with an obligation to buy. In the preceding summer transfer window, it was Chelsea who allowed one of their players to move to Manchester United after they sold Mason Mount to their Premier League rivals. It now looks like the two English giants could do even more business with each other, with United seemingly interested in one Chelsea star. United could rue allowing Sancho to join Chelsea. The 24-year-old has impressed at Stamford Bridge so far, registering three assists in four ga…