Jackson has been Chelsea's starting striker for the past two seasons, returning 30 goals in 81 appearances in all competitions, but that hasn't stopped the west London side recruiting Liam Delap from Ipswich and Joao Pedro from Brighton to increase the options at Enzo Maresca's disposal. United, meanwhile, have struggled with Rasmus Hojlund up front, while Joshua Zirkzee ended his debut season with only seven goals in 49 matches.