Liam Neeson Says He Thinks of Bruce Willis 'Every Day' After Willis' Aphasia Diagnosis

Steve Granitz/WireImage; Charles Sykes/Bravo/NBCU Photo Bank via Getty Images Bruce Willis (L); Liam Neeson

Liam Neeson is keeping Bruce Willis at the forefront of his thoughts.

Speaking with the New York Post ahead of the release of his film Memory — in which Neeson, 69, plays a hitman struggling with memory loss — the actor said of Willis, 67, "My heart goes out to him."

"I think about him every day," said Neeson of his fellow action-film star.

Willis' family shared last month that he is retiring from acting after being diagnosed with aphasia. According to Mayo Clinic, aphasia "robs you of the ability to communicate" and "can affect your ability to speak, write and understand language, both verbal and written."

Of the condition affecting an actor like Willis, Neeson told the Post, "It's particularly poignant, isn't it? I wish him all the best."

Never miss a story — sign up for PEOPLE's free daily newsletter to stay up-to-date on the best of what PEOPLE has to offer, from juicy celebrity news to compelling human-interest stories.

RELATED: Aphasia Can Have Many Causes — an Expert Shares What to Know About This "Complex" Condition

Willis' family revealed on social media that he is "stepping away from the career that has meant so much to him" after "experiencing some health issues," including a recent diagnosis with aphasia that is "impacting his cognitive abilities."

The Die Hard actor's wife Emma Heming Willis, with whom he shares two young daughters — Mabel, 10, and Evelyn, 7, plus ex-wife Demi Moore and their adult daughters Rumer Willis, 33, Scout Willis, 30, and Tallulah Willis, 38 — all signed the message that also read in part, "This is a really challenging time for our family and we are so appreciative of your continued love, compassion and support."

A source told PEOPLE in a cover story earlier this month that Willis' loved ones are more grateful than ever for joyful family times, including celebrating Mabel's 10th birthday two days after announcing his retirement.

"Emma is especially grateful for the daughters she shares with Bruce," the insider said. "Everyone is focused on all the happy moments they are able to share."

The star's family is "doing whatever they can [to support him]," a source close to Willis added. "They have rallied around him in a big way to help Bruce cope with what is to come."

RELATED VIDEO: Bruce Willis' Heartbreaking Diagnosis: Family Is "Focused on All the Happy Moments They Are Able to Share"

In Memory, Neeson plays an assassin-for-hire who is tasked with crossing his own personal moral code when he's assigned to take out a child.

While seeking revenge and going against those who put him up to the mission, he's also struggling with memory loss after being diagnosed with a condition, complicating his process.

Directed by Martin Campbell, Memory also stars Guy Pearce as an FBI agent also racing to hunt down the criminals who had hired Neeson's hitman character.

Memory is in theaters April 29.