"When we sign a striker I look at the defensive pairings of United and Chelsea and ask if we've signed a player who is going to cause them all sorts of problems," said Gerro.
"I did it with Torres and ended up with a smile on my face because I don't think anyone will enjoy playing against him.
"I've liked the way we've done business this summer. Previous years have shown how important it is to sort everything early in the pre-season, as it's not easy for players if they arrive just before the deadline.
"It makes it harder for them to settle. It's important we get off to a good start and that's going to be a lot easier if we have everyone here as soon as possible.
"Hopefully with everyone having had the right amount of rest this summer we'll be able to hit the ground running when the Premiership begins. People say you can't win the league in August but I believe you can certainly lose it in the first month.
"It's fine saying it's a nine-month season and there is plenty of time to recover from a shaky start but it's hard playing catch-up week-in, week-out.
"As footballers, we understand you're going to have to put it in during July to get your levels back to where they should be.
"But credit to the Spanish backroom staff, they know how to do it quickly, as painlessly as possible.
"I missed a bit of the last pre-season because of the World Cup. I came back and felt I needed more holiday.
"I was mentally and physically drained at the start of the season but this time I feel I've had a break and we will go into the season brimming with confidence."