PHILADELPHIA — The Archdiocese of Philadelphia expects to launch a fundraising campaign to help pay for a major convocation of Roman Catholic families and possible papal visit in 2015, Archbishop Charles Chaput said Tuesday.

His remarks about the planned World Meeting of Families came the same day the archdiocese reported spending more than $11 million on legal fees in the past two years, mostly on priest sexual-abuse cases.

“We’ll have to do some major fundraising, not just in the Archdiocese of Philadelphia, but in our country,” he said. “There will be a lot of work.”

Chaput did not estimate the cost of the international gathering that could bring tens of thousands of people to the city. No dates have yet been chosen, but he said his best guess would be five days in July or August.

Pope Benedict XVI announced Sunday that Philadelphia would be the site of the convocation, which is held every three years. The news came at the close of the seventh World Meeting of Families in Milan.

Chaput was in Italy for the announcement, though he said he was notified of Philadelphia’s selection about a month ago. In Milan, he was given the meeting’s “icon” — a large-scale mosaic of the Holy Family, which eventually will be displayed in Philadelphia, probably at the Cathedral Basilica of Saints Peter and Paul.

Back in Philadelphia on Tuesday, Chaput discussed creating a corporation to receive donations for the gathering. Registration fees for the event’s workshops and lectures will help recoup some costs, he said, but local Catholic officials will need up-front money for space rentals and other items.

The archdiocese has “serious” financial problems, having for many years spent more money than it has brought in, Chaput said. Also, Tuesday’s financial report doesn’t include the most recent legal costs incurred by a landmark priest-abuse trial now in the hands of a Philadelphia jury.

The weeks-long trial has cast a pall over the church, making the announcement of the World Meeting of Families most welcome, the archbishop said.

“I think God is giving us an opportunity to have some good news in the midst of a very difficult time,” Chaput said.

He stressed the event is in its earliest stages and will be overseen by local, national and international planning committees. The schedule for the pope, who will be 88 years old in 2015, won’t be known until several months before the gathering, Chaput said.

He also noted that he helped plan a similar event as a Colorado bishop. Pope John Paul II visited Denver for World Youth Day in 1993. Chaput described those preparations as “a very large, complicated matter.”

Some parishioners leaving the Cathedral of Saints Peter & Paul in central Philadelphia after Sunday Mass said they hoped the papal visit could help heal divisions caused by the church sex abuse scandals of recent years.

“I think the divisiveness because of the sex scandal has really impacted the attendance at Mass and just the unity of Catholics in the city,” said Mary Corcoran, who graduated from a Catholic school just up the street. “I think it just might bring some healing to us, having his presence here in the city.”

Eileen Jameson, 53, carrying her not-quite-2-year-old granddaughter Lyla down the cathedral steps after her very first Mass, said she thought anticipation of the visit could reinvigorate local Catholics after the scandals.

“I would think we could use a boost,” she said. “Even just the thought of it will, I think, make people a little happier about things.”