I have no idea in this particular case whether ten Hag made the decision as there is also a sporting director who is usually responsible for putting together the team. Under normal circumstances the coach has a word to say there too,
Yes, the coach has a lot to say in the kind of players they are bringing into the club, and if anyone is saying that Eric ten hang isn't given such privilege, that's is actually not true, because I know for a fact that Eric ten hang was the most supported manager at Manchester united since the days of sir Alex Ferguson, if Jose Mourinho, luis van gaal or ole gunnar solskjaer was supported in the transfer market the way Eric ten hang was supported, I believe that one of these three managers might have won the league, but with Eric ten hang, upon all the support he got from the hierarchy of Manchester united, in the transfer market and on disciplining of players, he still wasn't able to bring Manchester united to the top.
but as you could see when Tuchel was the coach for PSG, he didn't have a say when it came to putting together the team.
Then as for this statement here, this is actually not true, though their where some players that was signed that wasn't his decision, but he still got what he wanted in the type of quality of players he wanted in the team, he wasn't appreciated at psg, but when he was sacked, they later regretted it because psg hasn't been the same since he left, I believe that it was the strongest squad psg has ever had uptil date.
Lol dude do you even read what you are posting? Maybe you should share your secret contracts you have with those clubs that feed you with special information. Tuchel publicly said that Leonardo worked against him and signed players he never wanted. Do you need anymore information than that? Pep Guardiola and Klopp are coaches who always got what they wanted, but second tier coaches like ten Hag have much less to say than you think. That is how it is. Of course they can express their opinion, but in many clubs there is a sporting director deciding what the team should look like unless we are talking about the top tier coaches like Guardiola, Klopp, Ancelotti, Mourinho, a few more.