Tau joined Brighton & Hove Albion in 2018 but, due to work-permit complications, was loaned out to Belgian side Union SG with whom he won the Proximus League Player of the Season award.
[citation needed] On the advice of then-youth coach Rhulani Mokwena, he was loaned to National First Division side Witbank Spurs instead.
[7] After a season with Witbank Spurs, Tau rejoined Mamelodi Sundowns and was included in the squad for the club's CAF Champions League campaign.
He featured throughout and played every minute of both legs of a 3–1 aggregate win over Egyptian side Zamalek in the CAF Champions League Final.
[13] Brighton manager, Chris Hughton, confirmed that Tau would be loaned out shortly after his transfer, after failing a UK work permit, as well as him wanting the South African international to gain European football experience.
[17][18] On 15 August, Tau joined Belgian second division side Union SG, owned by Brighton chairman Tony Bloom, on a season-long loan.
[19][20] He was immediately introduced into the first team and played a particularly important role in the Belgian Cup during the first half of the season, scoring four goals in six appearances to help the club reach the semi-finals after recording historic wins over both Anderlecht and Genk.
Tau played 18 league matches scoring three as Club Bruges won the title, finishing 15 points clear of 2nd place.
[31] He made his debut for the club on 16 August 2020, coming on as a substitute in the 64th minute against Sint-Truiden, and scored his first goal as Anderlecht won the match 3-1.
[17][18] On 10 January 2021, 905 days after signing for The Seagulls Tau made his debut coming on as a substitute in an FA Cup third round tie away at Newport County in which Brighton eventually won on penalties.
[36] Tau played in the 2021 CAF Super Cup on 22 December, in which he assisted Al Ahly's goal in the eventual penalty shootout victory.
[38] Tau made his debut for South Africa on 17 October 2015 in a 0–2 loss to Angola in a 2016 African Nations Championship qualification match.