"But what we've got to ensure is that we don't get players in just for the sake of it.
"We'll keep going on those fronts. We've tried for a few and not always been successful.
"We've also had a lot thrown at us which we don't think are right for one reason or another, be it either wrong position or wrong age."
Keegan also reiterated his plans to retain the key members of his squad ahead of the 2008/09 campaign.
"Like I've said, we've got a small squad so it's no good getting one in to get one out, that just means you've maybe changed a position," he added.
"Obviously there will always be talk of players leaving because we've got some very good players here.
"But they will only leave here if we want them to, that's for sure. We're not looking to sell our top class players, we want to add top class players to play alongside them."