- Tag results for Dinesh Chandimal
Jos Buttler said the World Cup was in the back of everyone's mind, but they were taking every series one at a time and hoped to build a core group of players for next year's championship.
The world's number one ranked 50-over side, England are favourites despite a historically poor record on the island.
Mathews was earlier asked to step down from ODI captaincy after the Islanders crashed out of the Asia Cup following heavy defeats to Bangladesh and Afghanistan.
The sacking followed Sri Lanka's drubbing in the Asia Cup, with losses to lower-ranked Afghanistan and Bangladesh ensuring its quick exit from the competition.
Sri Lanka have been grappling with a leadership crisis over the last 18 months, during which Tharanga, Malinga, Kapugedera and Thisara Perera have also been tried as ODI captains.
The 28-year-old had sustained a finger injury during a match in the recently-concluded Sri Lanka Cricket T20 League 2018.
Chandimal was included in a 15-member squad for the one-off T20 that will round off South Africa's tour of the island nation Tuesday in Colombo, Sri Lanka Cricket said in a statement.
Chandimal, Hathurusingha and Gurusinha were banned for two Tests and four one-day internationals for violating the spirit of the game.
Sri Lanka captain Dinesh Chandimal, coach Chandika Hathurusinghe suspended for four ODIs, two Tests for ball-tempering
The duo, along with manager Asanka Gurusinha were handed the punishment after they pleaded guilty to "conduct contrary to the spirit of the game".
Chandimal, coach Chandika Hathurusingha and manager Asanka Gurusinha had pleaded guilty to violating the spirit of the game last month during Sri Lanka's second Test against the West Indies.
The ICC earlier this week unveiled tougher sanctions for ball tampering and sledging in a bid to improve on-field behaviour in the sport.
Sri Lanka sports minister Faiszer Mustapha, under whose oversight SLC is temporarily functioning, said the ICC sanctions alone would be sufficient.
Kusal Perera battled through a painful chest injury in partnership with namesake Dilruwan Perera to guide Sri Lanka to an historic series-levelling win.
Ranatunga said the island's cricket officials were to blame for the misconduct that saw Sri Lanka's skipper, coach and manager penalised during the second Test against the West Indies.
The Sri Lankans trail the three-match rubber 0-1 after losing the opener at Port of Spain and drawing the second Test at St. Lucia.