The exciting signings provide real flexibility and invention in attack and are already off the mark in terms of goals after both scoring in the 3-2 victory against Fulham last weekend. When Wayne Rooney returns from injury, competition for places will be particularly fierce.
"It’s not easy picking the team," stated the boss. "The players know that. I made reference to that last week. I’ve got a difficult job. The important thing is the end. If the end is right, we’re all satisfied and they've all contributed.
"Robin is flexible and can play different positions. He can play from the right side or in behind the strikers. There are great options with van Persie because he’s such a mobile player and Wayne can play in behind or play up. Chicharito is the only one-position player we have and that’s through the middle.
"Van Persie and Wayne can absolutely play together. No doubt. [Danny] Welbeck can play with him. We’ve got good options which is why it’s so difficult."
Sir Alex has also explained why he prefers to keep his cards close to his chest when it comes to team selection.
"Why should we let anyone know what the team is?" he asked. "It’s straightforward and why I never name the team until Saturday now.
"I used to name it on Friday when I first came down but it didn’t work. It was always in the papers.
"Everything we do in training is mixed with a variety of different players playing in different