James Haskell is unlikely to start the first Test against South Africa on Saturday after joining up late with the England squad.
The flanker arrived in Durban from New Zealand on Monday, after playing Super Rugby for Otago Highlanders.
Haskell's last Test for England was the World Cup quarter-final defeat by France last year.
"The reality is that he will train only once before we announce the team," said head coach Stuart Lancaster.
"Unfortunately for him the jetlag protocol stopped him from training on Monday. It doesn't preclude him but it makes it very hard."
Haskell has played 42 Test matches for England but is still waiting to play his first game under Lancaster.
His experience of southern hemisphere rugby should help England's cause during their three-Test series in South Africa this summer.
"He is very keen to come in and make a good impression and force his way into the Test team," Lancaster said.
"He talked about his experiences about playing Super Rugby against the South African sides and I talked him through the journey of the Six Nations and where we are now as a group."
Centre Manu Tuilagi returned to training after missing England's first two training sessions in South Africa with a foot injury.
A jarred knee stopped prop Alex Corbisiero training on Monday and wing David Strettle missed out because of a slight calf strain.