In need of a tireless powerhouse forward? Odsonne Edouard could prove to be your man up front! He is big and strong and is a good finisher at the age of 20. For a fee around 18m he could be yours and that is a fair price for a player like him. He won't be Aguero material, but he will most definitely develop into a very good striker.
Giovani lo Celso has the potential to become one of the best players in FM19. He is an awesome talent and he should be on your shortlist from day one. A single problem is a fixed transfer to Real Betis, who are able to sign the player for 30m. This will make it a bigger challenge to sign him during the first two seasons.