Mesut Ozil is "deeply disappointed" to be axed from Arsenal's Premier League squad and insists his loyalty to the club has not been reciprocated.
The 32-year-old is the highest-paid player in Arsenal's history but has now been omitted from both the Premier League and Europa League squads.
Ozil has not played a single minute for the Gunners since 7 March, having initially been a mainstay of the team following Mikel Arteta's appointment last year.
"This is a difficult message to write to the Arsenal fans that I've played for over the past few years," he wrote in a statement posted on social media.
"I'm really deeply disappointed by the fact that I have not been registered for the Premier League season for the time being."
Former Germany international Ozil went on to question Arsenal's loyalty.
He signed his current deal, which expires next year, in January 2018 - the same time Alexis Sanchez departed for Manchester United.
"Upon signing my new contract in 2018, I pledged my loyalty and allegiance to the club that I love, Arsenal, and it saddens me that this has not been reciprocated," he added.
"As I have just found out, loyalty is hard to come by nowadays. I've always tried to remain positive from week to week that there's maybe a chance to get back in the squad soon again. That's why I kept silent so far."
Ozil pledged to keep fighting to get back into the Arsenal squad and to continue to train to the best of his ability.
The German international said: "No matter what I will keep fighting hard and will not let my 8th season at Arsenal end like this.
"I can promise you this hard decision won't change anything in my mindset - I will continue to train as best I can and wherever possible use my voice against inhumanity and for justice."
Before the Covid-19 outbreak caused the season to be halted, Ozil had started every Premier League game since Arteta's appointment as head coach in December.
He has not been included a matchday squad since and - alongside Greece defender Sokratis Papastathopoulos who was also left out of both squads - Ozil will only be able to represent Arsenal Under-23s until 2021 at the earliest.
Ozil was reported to be one of three players who refused to take a pay cut earlier in the year, while the club also distanced themselves from a social media post made by Ozil in December which denounced the treatment of Uyghurs in China.
"Before the Coronavirus break I was really happy with the development under our new coach Mikel Arteta - we've been on a positive way and I would say my performances were on a really good level," the statement continued.
"But then things changed, again, and I was not longer (sic) allowed to play football for Arsenal."