England's Marcus Rashford expected to train fully on Friday

England forward Marcus Rashford has recovered from a slight knee injury and should return to full training with the team on Friday ahead of their World Cup opener against Tunisia on June 18.

The 20-year-old, who scored 13 goals for Manchester United in all competitions last season, impressed in the warm-up matches for Gareth Southgate's side but missed the team's training sessions earlier this week after picking up a knock.

"Marcus Rashford took part in light training this afternoon and will hopefully rejoin the group tomorrow," England said on their official Twitter account along with a video of Rashford in action.

The player thanked fans for their concern via social media on Thursday before reiterating his injury was just a minor one.

"Thanks for the messages I've been getting," Rashford posted on Twitter. "Picked up a slight niggle but nothing to worry about #ThreeLions"

Rashford, who was the only squad member absent from training on Thursday morning, will be hoping to secure a spot in the starting lineup against Tunisia after his eye-catching performance in England's final pre-World Cup match against Costa Rica, where he scored a stunning strike to open the scoring in a 2-0 victory last week.

Southgate said Rashford had been trying too hard to impress before the match. But a chat with the player saw a greatly improved performance against the Central Americans.

"For me, at the end of the season, he cares so much you can see he was trying too hard," Southgate said after the win at Elland Road.

"I said to all of the team before the game: 'I expect to see mistakes tonight and if I don't there'd probably be a problem because we won't be trying to be as good as we might.'

"With attacking players in particular, if they're going to try things and take people on and be creative, they're going to lose the ball and they're going to make errors.

"But then they might produce some of the moments we saw from Marcus tonight.

"I mean the goal was world-class, really, but he's teasing defenders by the touchline and his performance wasn't perfect, but he was enjoying his football and that was great to see."

Information from Reuters was used in this report.