Arsène Wenger has signed attacking duo Lukas Podolski and Olivier Giroud, while the Gunners boss also completed a deal for Malaga’s Santi Cazorla earlier this week.
And Mertesacker, who joined the north London club from Werder Bremen last summer, is confident Arsenal have strengthened enough to show an improvement in the new campaign.
“I think we have a better situation than last year,” Mertesacker told Arsenal’s website.
“The team is full of characters, good players and every position [has competition]. So I am looking forward to the season because I think we can show the potential we have in a better way than last year.
“We need good signings and I feel that these players will help us a lot. Giroud is a good striker and I have seen a lot of him in training because he was not out in Asia, so we trained a lot together.
“He made a good effort and hopefully in the games he will show that as well.
“Santi Cazorla has just signed so we will see him in training and in games in the short term.”
Mertesacker also revealed he has helped his fellow Germany international Podolski settle in London since his move from Cologne.
“I try to do my very best [to help him settle],” he added.
“I had the same thing last year and it is good to have a lot of help in your first moments in a new city with a new language. It is good to have some German friends around you.
“But the club is doing well also. You have a lot of people who have been very helpful from the beginning.
“Everything is going fine for him and I am very happy that he is here to give his best for Arsenal.
“From the beginning he was confident about speaking English. He is a confident guy with more than 100 caps for Germany, so he has massive experience. For us to have him here is a massive impact.”
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