Roberto Martinez has seen Mohamed Diame, Chris Kirkland, Hugo Rodallega, Hendry Thomas and Steve Gohouri all leave Wigan over the summer, but the Latics boss will not panic buy replacements.
"Where we are now, we are very strong with the group of players we have, and we're going to take our time over our next step," he told the Wigan Evening Post.
"We'll continue working hard with the group of players we have, while at the same time behind the scenes continuing to identify the targets we have.
"We have a few options, but we need to make sure we get the right players in who will add to the already great group of players we have.
"If that takes until the end of August, then so be it, because we need to make sure we are as strong as we can be at the start of September not the start of pre-season."
But the Spaniard believes it has been a successful summer with regard to transfers despite the one-way traffic.
"The most important target for the off-season was keeping together the nucleus of the squad that performed so well last season together, and so far we have managed to do that," he added.
"We plan on making two major signings this summer, plus probably another younger player.
"We know exactly what we need, what type of player we need to improve the squad, but firstly I would like to see the existing individuals, and how they are.
"There are a few youngsters that have made the step up from the development squad into the first-team squad, and it's important we assess them before we do anything else."