Super Eagles midfielder Joe Aribo has made his first appearance for Southampton in Saturday's 3-1 defeat to RB Leipzig.
The former Rangers man recently completed a move to the St Mary's stadium from the Scottish Premiership side in a deal worth £6m.
Hasenhüttl handed debuts to all five of his summer signings including Aribo, using 24 players in total in a 105-minute contest played in sweltering temperatures.
Aribo donned his new number seven jersey for the first time as the Saints took on the German Bundesliga side in one of their test games ahead of the new season.
The Nigerian international played for 61 minutes before he was replaced by Che Adams. Although Aribo majorly plays as a midfielder, he was deployed further up front in the game against Leipzig.
He played quite well in multiple roles last term when Rangers had numerous injury concerns and even went on to score for his side in the Europa League final loss against Frankfurt.
Although Aribo's debut for Southampton did not end well as the Saints lost 3-1 to the German Bundesliga side, he should still be proud of his efforts on the pitch in his very first game.
It was a ding-dong affair between the two sides in the opening exchanges as chances were few. And the first real chance of the game came in the 40th minute. However, Southampton goalkeeper Gavin Bazunu was equal to the task. That half ended goalless with the game evenly balanced.
It was the Germans who started the second half brightly and deservedly went in front just nine minutes after the break courtesy of a direct free-kick from former Manchester City full-back Angelino.
Southampton boss Ralph Hasenhuttl made a series of changes to his English side and they were back on level terms through Adam Armstrong in the 65th minute.
However, Leipzig restored their lead three minutes later through Emil Fosberg before Illiax Moriba added a third in the 90th minute to secure a 3-1 win for the German side.
Aribo and Southampton will continue their preseason preparations with another test game against SK Austria Klagenfurt on Monday.
This article was most recently revised and updated 3 weeks ago