They did not speak to the media but made their way into the bus.
The friendly game was arranged to commemorate the centenary of the birth of Nelson Mandela, with Valverde continuing: "For us it's an honour that we've been invited for such a celebration".
After the final whistle sounded, Arendse swapped shirts with Messi, who was only introduced into the match in the 74th minute to loud cheers from the crowd.
He had not appeared until kick-off, wrapped up against the chilly air as he took his place on the bench, but television pictures showed some female fans in tears as the Spanish champions came on to warm up.
You know Mzansi fam, that soccer match between Sundowns and Barcelona was never going to be just about the soccer.
Earlier, Messi and the rest of the squad drew hundreds of South Africans to OR Tambo Airport in Johannesburg at 6 a.m. local time to see Barcelona arrive. Among them was Confederation of African Football (Caf) president Ahmad.
"The match was originally fixed for Tuesday, 15 May 2018 but was postponed at the request of Mamelodi Sundowns", it said.
The match will now be play in Conakry on 22 May. Barcelona fielded two completely different lineups in each half.
Ousmane Dembele, Luis Suarez and Andre Gomes scored for Barcelona against the South African league victor in a game that formed part of South Africa's celebrations to mark 100 years since the birth of Nelson Mandela, the anti-apartheid icon who died in 2013.
Although clearly second best, the 2016 African champions never lost heart and were rewarded when Vilakazi scored on 76 minutes as Barcelona appealed for offside. Messi and his team players later made their way to the scene of Spain's World Cup triumph in 2010.