Robert Lewandowski has cut ties with Chinese technology company Huawei amid unconfirmed rumours they are helping Russia defended themselves against cyber attacks.
Huawei have firmly denied claims of involvement with Russia and there is no evidence to support the claims.
But Lewandowski has taken a stand and cut ties with the company in a move that will cost him around €5m (£4.14m) having recently signed a three-year deal with the technology giants.
"Huawei CBG Polska regrets the end of the partnership with Robert Lewandowski. We appreciate our long-term cooperation and wish him every success in the future," read an update from the company.
The striker's agent, Tomasz Zawiślak, also provided an update, revealing to Interia Sport that the breakdown of the sponsorship deal came from Lewandowski's decision rather than Huawei.
"It is true. Today we decided to end the marketing cooperation between Robert Lewandowski and the Huawei brand," he explained.
"Therefore, the implementation of all promotional services has been suspended on our part."
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Zawiślak was asked whether Lewandowski's decision was also inspired by the fact that Huawei are one of the few companies still operating in Russia.
He remained coy, claiming: "We do not have full information on this, so I will stop at what we have already stated."
Russian president Vladimir Putin ordered his troops to invade neighbouring Ukraine - a sovereign state - last month, triggering a bloody war in eastern Europe.
Poland international Lewandowski has been a vocal critic of Putin's invasion and led his country's boycott of their World Cup play-off with Russia.
The game was due to take place later this month but has now been scrapped, as Russia have been banned by FIFA and UEFA - in part due to Lewandowski's stance.
"It is the right decision!" tweeted Lewandowski's as Poland's boycott was announced.
"I can't imagine playing a match with the Russian National Team in a situation when armed aggression in Ukraine continues.
"Russian footballers and fans are not responsible for this, but we can't pretend that nothing is happening."
Poland FA president Cezary Kulesza added: "No more words, time to act!
"Due to the escalation of the aggression of the Russian Federation towards Ukraine, the Polish national team does not intend to play the play-off match against the republic of Russia. This is the only right decision."
Aston Villa and Poland defender Matty Cash continued: "It is not an easy decision, but there are more important things in life than football."
Lewandowski is one of the greatest strikers in the history of European football and the reigning two-time world footballer of the year.
The Bayern Munich star first agreed a deal with Huawei in November 2015.
FIFA and UEFA banned Russia and it's clubs from international competitions at the end of last month, leading to Spartak Moscow being knocked out of the Europa League.
Russia are now very unlikely to participate in this year's World Cup, unless a ceasefire can be agreed before this month's World Cup qualifiers.
Even if that's achieved, it'll be hard for Poland and other international teams to face Russia considering the country's aggressive acts in Ukraine.
Russia have also been stripped of this season's Champions League final, which was set to be played in Zenit St Petersburg. The game will now be held in Paris.
FIFA and UEFA were both criticised for their slow responses to Putin's actions, not banning Russia until four days after their widescale invasion of Ukraine.
The invasion was expected, too. Russia began building up troops on the Ukrainian border nearly a year ago and ordered troops to enter the sovereign state on February 21.
FIFA initially refused to ban Russia, ordering them to compete under the brand "Football Union of Russia". The governing body's decision was widely condemned.
"Football is fully united here and in full solidarity with all the people affected in Ukraine," read a joint statement from FIFA and UEFA.
"Both Presidents hope that the situation in Ukraine will improve significantly and rapidly so that football can again be a vector for unity and peace amongst people."
