3. Richarlison
While Everton would hate to part with Richarlison, a big-money offer could get them thinking. Richarlison is a very versatile attacking player and can play anywhere. His one and half-season at Everton have shown what an attacking threat he can be.
Richarlison has enjoyed success from whichever position he has played from and hence serves as a significant threat to the opposition As seen with Chelsea's last few outings that there has been a lack of firepower coming from the bench as most of their attacking players are forced to start.
The Brazilian boasts of creating an immediate impact, whether it be from the start or through the bench. Richarlison has excellent finishing and vision, but it is aerially where he is the most dominant.
Given the departure of Marco Silva, the versatile attacker may be open for a move and interest from Chelsea might be tempting enough. Lampard would have a fantastic asset to the team and would love to work with a player of this dynamic.
Alternate option: Mikel Oyarzabal (Real Sociedad)