His market value down to 40 Million Euros, which is acceptable if Aston Villa want to spend for such amount.
But I doubt Aston Villa can afford to pay his salary, currently the highest salary in Aston Villa is Tielemans, 7.8 Million Euros, that's 2.5 times lower than Vlahovic's salary. Vlahovic have to cut down his salary, Aston Villa might able to pay half of his current salary if we judge based on his current performance.
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.