In the last 2/3 seasons there has been quite a drop off in his goals and games in the PL. Hardly missed a game in 4 seasons and scored 25 - 30 goals a season. Then in the last 2/3 years hes missed around 10 PL games a season and his goal scoring numbers have dropped down considerably.
Personally i think he'd score bag fulls of goals for us, but there is a slight concern over his ankles and general ability to stay fit, which could well get worse as he gets older. Its an expensive risk to take imo, but if Haaland isnt available, one i think we will take.