England seamer Chris Tremlett has insisted he is close to regaining full fitness.
Tremlett, who last played international cricket in January 2012, was limited to a single County Championship match for Surrey last year by knee and back injuries.
The tall 31-year-old, however, has been steadily increasing his workload during January and February - and will travel to Potchefstroom in South Africa alongside the England development squad.
"It has been going really well. We've been in the indoor school for the last month or so, stepping it up each week. During the last three weeks, I'm not far off from sending it down at near 100 percent," he told Surrey TV.
"I'm looking forward to getting out to South Africa now - it's a great opportunity which the ECB have given me to go over there and join a couple of the Surrey lads and will be a good progression to get outside and up the intensity of my bowling."
Tremlett has played 11 Tests, 15 ODIs and one T20I across a stop-start career, which started in 2005 and has since been plagued by injury.