
The 23-year-old Brighton central defender made his international debut in the 1-0 friendly win over Austria last week and backed that up in today’s match against the Romanians.
Alexander-Arnold was ruled out after suffering a thigh injury in the Austria match and Southgate took his time to decide which of his standby players would come in.
White had an outstanding season for Brighton – his first in the Premier League – after being pivotal to Leeds United’s promotion from the Championship while on loan in the 2019/20 campaign.
Southgate has opted for a central defender with Manchester United captain Harry Maguire battling to recover from an ankle injury.
Everton defender Ben Godfrey and Southampton captain James Ward-Prowse were other options who both started the Romania game, while Jesse Lingard and Ollie Watkins were also on the standby list, but will now return home.
England kick off their Euro 2020 campaign on Sunday at Wembley against Croatia, who beat them in the 2018 World Cup semifinals.