sorry Gab, there is no way to identify ft before purchasing.
The only trick I 've found is value sorting.
It's been 5 seasons now (LV 37-41) were all the young 5* players have the same price - 127 M'.

In some older version, you could see in mobile some digits to (127,3 M' ... 127,7 M') so that could help.


* a myth saying that the first devs didn't predict this success of TE, so "build" the game till LV15-20 (achievements, facilities, values ...), for a period of 1,5 - 2 years of playing.