I think 40 million is still too high considering his statistics which are not impressive enough during his time with Juventus but maybe things will change elsewhere and Vlahovic can show his extraordinary talent later with Aston Villa but the problem is not about the price tag but his salary which is quite high. Aston Villa must consider it very carefully because Vlahovic could fail to give his best performance in the Premier League.
It's still better.
Vlahovic: 29 matches, 10 goals, 4 assists, 40 Million Euros.
Nunez: 30 matches, 5 goals, 2 assists, 60 Million Euros.
The strategy to sign a high salary player is only sign for 1-2 years, if he play good, it's as expected. If he play bad, Aston Villa won't loss too much.