Robbie Neilson feels he has enough cover at the back now after turning away a defender on trial.
Davidson Eden, a 28-year-old Ghanaian who has plied his trade largely in Germany, spent a few weeks training with Dons, but didn't make an impression on Neilson.
In the absence of Dean Lewington in recent weeks, and the suspension of Joe Walsh, Ben Tilney made his first two league starts for the club, and after impressing his manager, Neilson now believes he has enough cover for the rest of the season, but is seeking out talent for next season already.
He said: "We had a guy in last week, Davidson Eden, but I didn't think he was going to add anything to the squad. He would have just been making the numbers up, and there was no point in doing that, so we can give the younger boys a chance.
"I've got another young lad in today with a view to next season. We're now gearing up for next season. There aren't many games left to go out and watch people, so we have to make sure, right now, we're targeting exactly what we want and making sure we're covering all our bases.
"We've had opportunities to give young players the chance to come in, and now we've got competition. There was a time we were struggling for defenders.
"I felt Ben Tilney came in and did a really good job but he's still a young kid, and George Williams can cover both sides and at centre half. It's now down to me to pick a team that will win a game."
One man who isn't likely to be in the running for a place this season though is Scott Wootton. The defender has been out since September with a cruciate ligament injury, and Neilson had hoped to cast an eye over him before the season was done.
However, the manager says he won't be rushing back the former Leeds man.
"He's doing well, but he's had a setback here and there," Neilson added. "I would have liked to have him before the end of the season, but the main aim is that he's ready for the first day of pre-season.
"There's no pressure to bring him back too early. It's important we don't panic and try and get him back with no problems and push on."
Like us on Facebook to get all the latest MK Dons headlines in your timeline: www.facebook.com/mkcitizensport