Marc Wilmots is keen to plan for a Belgium defence without injury-plagued captain Vincent Kompany.
Kompany made just 22 appearances for Manchester City in all competitions in 2015-16 and a thigh problem has ruled him out of Euro 2016.
After shoddy defending enabled Finland to take the lead through Kasper Hamalainen in a 1-1 draw in Brussels on Wednesday, Wilmots admitted a new consistent pairing at the back is needed to replace Kompany and former international Daniel Van Buyten.
"We need time to establish this defence. An understanding will come, especially with the high pressing we tried," he told RTBF.
"We had Kompany and Van Buyten before, we must now build a new central defensive pairing for the future of the [Red] Devils."
"You can see things in different ways. Our four defenders played high and created chances, but face it, there were five Finnish defenders and it was difficult to find an opening. They also had a sensational goalkeeper," said the Belgium coach.
"This kind of game is difficult to experience. We had many chances but there were too few goals.
"Maybe the wingers played too high because we absolutely wanted to score and this left space behind for the Finns."
