Ive never heard of Lacazette.
And im very wary about buying a player who has had one good season.
Like Muriel last year, Michu, Bony etc
What you want is a player who is progressing and trending upwards in goals, it doesnt need to be loads now but if their career is
1
4
12
16
Or something like that and they are under 25 and play in a decent league they are probably a good bet.
I dunno who that is like but that kind of player.
I know someone like that. His stats went like this:
Season App Goals
2011–12 3 0
2012–13 24 2
2013–14 30 9