
Jordan was at the heart of England's 81-run Duckworth-Lewis victory in Thursday's rain-marred clash at The Oval, his former home ground.
Now with Sussex after being released by Surrey, the Barbados-born all-rounder starred with both bat and ball in the day-night clash at his old home ground.
His unbeaten 38 not out off just 13 balls helped propel England to 247-6 in their 29 overs.
And the fast-bowler then took three wickets for three runs at a key stage in the game to derail Sri Lanka's pursuit of 226 in 32 overs after a second rain delay.
New England number three Gary Ballance weighed in with a valuable 64 and Ian Bell made a typically elegant 50 but Cook was in no doubt that Jordan, who finished with three from 25 in six overs, had turned the match the hosts' way.
"It was a fantastic performance," said Cook, who had little to celebrate during England's 5-0 Ashes series thrashing in Australia.
"To come in and whack it like he did – he hit a really clean ball, against a very good death bowler [Lasith Malinga] – was a credit.
"That extra 30-odd we got in the last two overs gave us that momentum swing we really needed.
"He probably didn't start off as well in the first two overs [with the ball]. But when he came back, he flew in and he bowled quickly.
"Those wickets he got, it looked very uncomfortable batting."
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