The West Ham captain is a major part of Gareth Southgate's side, playing a key role in last year's run to the European Championship final and starting all four matches so far in Qatar.
Rice is among the first names on the team sheet so the midfielder's absence from training on Wednesday at England's Al Wakrah training base caused alarm.
The 23-year-old felt unwell but fellow midfielder Kalvin Phillips confirmed he returned in Thursday's session, which was held behind closed doors.
"I believe Dec is fit, he's back in training and he's fine," the Manchester City man said.
"If something goes wrong then I'll be there and I'll do my best to be fit for 90 minutes.
"I want to play as many minutes as possible. Regardless of whether Dec is playing or I am, we'll do our best."
England powered into the quarter-final following a 3-0 victory over Senegal.
The Three Lions will now turn their attention to France as they look to book their spot in a second successive World Cup semi-final.
Les Bleus progressed to the last-eight following a comfortable 3-1 win against Poland.