According to reports, the 30-year-old is fed up with the criticism he gets from fans and pundits, especially this season which has seen the player turn into a punching bag of some sort whenever Simba SC loses.
Onyango joined Simba SC from Kenya's Gor Mahia in August 2020, initially on a two-year contract, and agreed on fresh terms last June, extending his stay for another two years.
However, he now appears to be ready to depart a year before his contract runs out due to frustrations.
In yesterday morning's post on one of his social media platforms, Onyango wrote 'time is over now' accompanied by a photo of him disengaging from the club's bus.
According to multiple reports from the club and Tanzania's media outlets, the Kenyan has reportedly handed in a request to leave the club after close to three years with the outfit nicknamed 'Wekundu wa Msimbazi'.
This is not the first time that Onyango is seeking to leave the club having tried the same in August last year, he even downed tools in protest and did not travel with the Tanzanian side to Sudan where the squad participated in two friendlies.
At that time, the defender was having limited playing time following the arrival of Ivorian Mohamed Ouattara who had been preferred by the then tactician, Zoran Manojlovic, to partner Henock Inonga in central defense.
Onyango moved to the Tanzania Football Federation (TFF) Legal and Player's Status Committee seeking to terminate his contract with Simba after the transfer window was closed but his request was thrown out.
However, the exit of tactician Manojlovic from the summit of the club's technical bench and the subsequent takeover by Juma Mgunda on an interim basis gave the Kenyan a new lease of life that extended even when the current coach Roberto Oliveira 'Robertinho' arrived.
He has been the preferred pick for Robertinho, especially in the 2022/23 CAF Champions League but a couple of howlers the footballer committed in Africa's premier competition saw a section of Simba SC fans call for his ouster.
Onyango, ‘Berlin Wall’ as he is popularly known, has been a mainstay in Simba SC’s defense, playing nearly every match alongside his center-back partner Congolese Baka.
He has, however, had to endure constant criticism but Robertinho has kept trust with the defender and the tactician's loyalty has been rewarded with top performances from the former Gor Mahia player.
His performance in his side's Azam Sports Federation Cup (ASFC) semi-final clash versus Azam FC in Mtwara last weekend, which witnessed Simba SC conceding a 2-1 loss, further elicited criticism.
Simba SC lovers earlier turned on him last month when the squad was eliminated from the 2022/23 CAF Champions League by holders Morocco's Wydad Casablanca at the quarterfinal stage.
The team was beaten 5-3 by Wydad Casablanca on post-match penalties following a 1-1 draw on aggregate but, unlike the norm when those who miss spot-kicks get the blame, a handful of Simba SC supporters singled Onyango out for criticism over what they claimed 'poor defending'.
It was the second time in one month that he was coming under heavy criticism after they called for him to be dropped once the club lost 3-1 away to Raja Casablanca in Morocco in the premier continental competition Group Stage on April 1.
The former Gor Mahia defender joined Simba SC in August 2020 after a stellar performance with the record Kenyan champions.
Onyango has won three trophies with Simba SC, the Premier League title, ASFC in 2020/21, as well as the Mapinduzi Cup last season.
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