Ikea spokeswoman Tina Kardum said the product had only been on sale for a month when it was pulled off the shelves on March 22.
The company didn't announce the withdrawal publicly until Swedish newspaper Svenska Dagbladet wrote about it Saturday.
Kardum said the company found out Friday that a follow-up test in Belgium confirmed the lasagna contained 1.6 percent pork.
"We have more information now. That's why we choose to inform now," Kardum said.
Moose meat is common in Sweden though it's not typically used in lasagna.
Ikea has previously recalled meatballs and other meat products sold in its cafeterias and frozen foods sections after tests showed they contained traces of horsemeat.
The Swedish furniture giant is one of many European companies caught up in a scandal over mislabeled meat in frozen food products.
Ikea's withdrawn products came from a Swedish frozen foods maker, which in turn blamed the mislabeling on its meat suppliers.
More Nation & World Headlines
Memories, tears mark newscast a day after on-air shootings 7:49 a.m. Stabbing suspect who killed Louisiana officer was copís cousin 7:47 a.m. Shooter was Ďa man with a lot of anger,í station manager says Pentagon probing alleged distorting of war intelligence Saudi arrested in 1996 bombing that killed 19 Americans Judge sentences Holmes to life for Colorado theater shooting State Department officials routinely sent secrets over email 51 bodies found in hull of migrant ship off Libya
Our new comment system is not supported in IE 7. Please upgrade your browser here.