Bielsa is a good manager but hes a bit of a maverick type, it will either click and work or struggle, not sure he would be the type to take a calculated gamble on, Sampaoli i don't know much about and hes had a lot of credit for his work with Chile but i do know he made some crazy team selections at times with the likes of Medel and Gonzalo Jara (players who never made it in england) in CB when they are both not even 5'10 tall xD I doubt he would consider here anyway considering his current reputation in football.
We've tended to do well on taking a gamble on young managers within the UK but they all currently suffer the same defensive issues, Howe, Neil etc..
There is a few in the lower leagues i admire but they would be seen as huge gambles for the position we're currently in, its not like the Moyes days anymore so managers like Rowett (rate highly), Dyche (probably a lower prem manager but doesnt get the credit he deserves), Karanka are seen as too much of a risk.