That's a great strikeforce. As long as Rooney is playing well, you should be nearly set.
You probably want to acquire one more veteran to supplement them for the days that Rooney is cold though.
I would recommend that you get a striker/winger so that you can also have enough reps for them on the 1st team so they don't get unhappy.
Some good choices for that kind of player include Neymar ST/AML (very hard to sign but world class), Edinson Cavani ST/AMR, and El Shaarawy AMLRC/ST.
PS I don't know how well Munir has been playing for you but he has been very consistently good for my Liverpool side. Putting up 15+ goals for two seasons now. I acquired him from Barcelona in year 2 of my save.