Celtic manager Brendan Rodgers described the departure of Liel Abada as "desperately sad" but best for both parties after the Israel international moved to Major League Soccer side Charlotte FC.
Abada last played for Celtic in a 2-1 win over Hibernian on February 7, after which Rodgers felt he was not able to focus on reaching his peak.
The 22-year-old had come under major pressure in his homeland amid Celtic supporters' backing for the Palestinian people, with an international team-mate even publicly advising him to move on.
He signed a new four-year deal in September last year, just before suffering a thigh injury which kept him out for the best part of four months.
- Scottish Premiership title race: Will Celtic or Rangers finish top?
- NOW Sports Month Membership just £21 a month for 12 months
- Crucial Old Firm title-race clash live on Sky Sports
Rodgers bemoaned the loss of the opportunity to work with the winger who scored 29 goals in 112 appearances.
"Firstly, it's desperately sad, the whole situation," the Celtic boss said. "A fantastic young player, came here as a 19-year-old, to another country and lit up the field with so many fantastic goals and had a really successful period.
"Whatever doubts he had in the summer, he was really happy to commit and sign a new deal.
"And now, through probably no fault of his own or the club's, he has had to leave to take his career elsewhere.
"I spoke to Liel on Monday evening, we had him round the house, because I knew he was going to be travelling the next morning.
"It's desperately sad because I was really, really looking forward to working with him over a period of time and seeing if we could develop his game.
"But if you look back, he has created some wonderful memories here at Celtic and I'm sure Glasgow will have a big place in his heart, and we wish him all the very best over in America."
The situation flared up the day after the October 7 attacks in Israel when banners among Celtic fans which read "Free Palestine" and "Victory to the resistance" drew anger in Israel, including from former Hoops midfielder Nir Bitton.
Abada was given a huge ovation when he made his comeback against Rangers on December 30 but he did not rediscover his spark and he disappeared down the tunnel at Easter Road while his colleagues celebrated a last-gasp win after what proved to be a quiet, final appearance for Celtic.
"It was really, really difficult for him," Rodgers said. "He was training every day, committed to his work, he is a top professional. But the situation, how it evolved, it felt very difficult.
"And football is a game very much of the mind. If you're not quite focused or if you can't put something aside, something as big as this, then of course it becomes very, very difficult to be at your very, very best. Sadly, that was the case for him.
"We spoke most days, just checking in to make sure he was OK, seeing him in his training, but ultimately he wants to play football.
"And when it got to the situation where I felt there was no chance, we both looked at it, and as a club as well, felt that the best possibility would be for him to move on."
When asked whether pressure from Israel was weighing heavily on the player, Rodgers said: "It's clearly a situation that was unplanned, and wherever it comes from, there were multiple reasons not to be in that frame of mind.
"But, listen, it's done now. He has moved on, had a great two-and-a-half years, done very well, and we have to move on."
Abada: Leaving was not in my plans
On social media on Thursday night, Abada admitted that it was not in his plans to leave Celtic and thanked his family, the club and their fans for their support during "very difficult times".
He said: "Where do I even begin? Leaving Celtic wasn't in my plans, yet life's unpredictable turns remind us that we're not always in control. The past six months have been a personal challenge, yet the overwhelming support from the Gaffer, coaches, and board has been my rock. Their unwavering faith during these times won't be forgotten but cherished forever.
"Reflecting on my journey here brings a smile to my face, the trophies lifted, goals celebrated, electric atmospheres, and moments of pure bliss will forever be etched in my memory."
He continued: "And last but not least thank you to all the Celtic fans. Recent times were very difficult for myself and my family but I want to say thank you to all the Celtic fans that stood by me, supported and respected me as a Celtic player and I hope that I have given you few moments to remember me by."
Bernabei departs on loan
Abada was the second player to leave Celtic Park on Thursday, with left-back Alexandro Bernabei joining Brazilian side Internacional on loan for the rest of 2024.
The Porto Allegre-based club confirmed the deal for the Argentinian, 23, who has only made 16 starts since arriving at Celtic Park in the summer of 2022.
Four of those starts came under Brendan Rodgers, all of them since the winter break when Greg Taylor was missing with a calf problem.