The pair worked together last season at RB Leipzig, where Lookman spent time on-loan.
Now Hasenhuttl is ready for a reunion with the England U21 international, who is pushing for regular first team football.
Lookman said just this week, "Football is football. I love playing football and I am glad to do that every single day. It is not a case of me being sad. I am just happy to play football
"People said at the time I was crazy to go to Germany but I saw it as another experience and another learning curve for me. I'm glad I did go.
"I learnt about being more of a goal threat and showing what I can do. Showing my worth to the team - that is the next step for me."