England's bowlers delivered at the death to help their side beat Pakistan in the second ODI. AFP

Following a good performance by England's bowlers in closing out the second ODI against Pakistan, Eoin Morgan admits that deciding which ones to include in England's final World Cup party won't be an easy decision.

England have picked a 17-man squad for this series and will rotate their bowlers in a bid to give them all opportunities to show what they can do ahead of the final squad announcement on May 21. Two of those involved in this series will, however, miss out with Jofra Archer likely to be included after an eye-catching performance in the first game.

Archer was rested for this game at the Ageas Bowl which gave David Willey a start and the left-armer responded with a fine display, particularly in the last ten overs in a role which he doesn't usually play. His spell of 2-17 off three overs at that stage of the game was pivotal in England reigning Pakistan in as they pursued the home side's 373-3.

"I thought he bowled beautifully, even when he came back in the middle," Morgan said of Willey. "He normally bowls a couple more up front when it swings a bit more but today it didn't actually swing that much, maybe for six or seven balls. I thought all of the bowlers, including Dave, who were put under the pump when we couldn't take wickets throughout that whole 30 over period, were brilliant. They reacted really well."

Chris Woakes and Liam Plunkett also did their case no harm and the competition seems to be spurring England's bowlers on to greater heights. "They're all pushing each other," Morgan said. "It's a bit like our batting unit the last two or three years. Guys who come in and do well have missed out.

"Unfortunately, a couple of guys from this 17 will miss out and it's going to be a tough decision regardless of how they perform in the rest of this series because of what they've contributed over a long period of time."

Those looking most vulnerable are Chris Jordan and Tom Curran, neither of whom have played yet in the series. The experience of Willey and Plunkett may see them get the nod and they are two players who Morgan trusts.

"For the last four years, David Willey and Liam Plunkett in particular have reacted really well to being put under pressure," he said. "You ask them to do more and they respond really well. They probably don't get the praise that they should or that other guys get. But the more responsibility we've given them, they've reacted really well."

Morgan was also happy with how his batsman had fared on a fine wicket in Southampton. There were runs for all five English batsmen required - Joe Root's 40 was the lowest score - and good news on the injury front as Jason Roy returned to the team after a back injury and shared in a 115 run stand with Jonny Bairstow. Then at the death, Jos Buttler stole the show somewhat.

"It was a belting wicket," Morgan said. "It got better as the day went on. I thought we started really well. Jonny and Jason again. Jason, very encouraging coming back in from injury, getting a run around like that and pulling up fine. Joe getting some time in the middle and then Jos coming in and playing like that, it's outstanding.

"He's very good. He really is," Morgan said of Buttler to Sky Sports. "I was in prime position to see the whole innings and his freakish knocks seem to be getting closer and closer together, so that's a good sign for us moving forward. But he seems to have a gear that not many of us have. I certainly don't have it, but it's great to watch.

"He always seem to time his run really well, regardless of what time he comes in, he always seems to have enough balls to go on and bang a 50-ball hundred. He was brilliant and the difference in the two teams."