Pakistan’s Babar Azam bats during training session at the National Cricket Stadium, in Karachi on Saturday. AP
The long-awaited return of England comes five months after a trouble-free tour by Australia, their first in 24 years, which helped Pakistan's rehabilitation as a safe place to play cricket.
International cricket has gradually returned to Pakistan following years where they were forced to play home matches in neutral venues after a deadly attack on the Sri Lanka team bus in 2009.
England had been originally scheduled to arrive in October last year but cancelled at short notice after New Zealand pulled out of a tour citing safety concerns.
England's James Michael Vince bats at the nets during a training session in Karachi on Saturday. AFP
England's withdrawal infuriated the Pakistan Cricket Board, who called it "disrespectful" as they made strides to show the country was a secure destination.
England, the current 50-over world champions, are also scheduled to play a Test series in Pakistan in December followed by the return of New Zealand.
The tourists are looking to bounce back from recent Twenty20 series defeats to the West Indies (3-2), South Africa and India (both 2-1).
Pakistan are looking to recover after losing the T20 Asia Cup final to Sri Lanka in the UAE last week.
New England skipper Jos Buttler, who took over after the retirement of long-time captain Eoin Morgan this year, is nursing a calf injury that could keep him out of the series.
"It's an important series for the build-up towards that World Cup," said Buttler, who felt it was vital to travel with his side despite only having a chance of being fit for the final two matches.
Pakistan cricket players practice at the nets during a training session at the National Cricket Stadium in Karachi. AFP
"Obviously the main aim for everyone is to turn up fully ready for that World Cup," said Buttler.
"Pakistan are a very strong team and will give us a really tough challenge," added Buttler.
Moeen Ali will lead the side in his absence.
The return of explosive opener Alex Hales from three years in the wilderness after testing positive for a recreational drug will bolster England batting, according to Pakistan's top order batsman Shan Masood.
"I think England are one of the best white-ball teams," said Masood, who will make his Twenty20 debut for Pakistan as a reward for scoring heavily for Derbyshire in the English T20 Blitz.
"England will pose a very good challenge for us and it's probably the ideal preparation to play one of the best sides before the World Cup."
The first four matches are in Karachi on September 20, 22, 23 and 25 with the final three in Lahore on September 28, 30 and October 2.
A head-of-state style security cordon is being thrown around the England entourage, similar to that successfully employed for the Australia tour.
Officials said 4,000 police and paramilitary personnel will be on duty to guard the teams and stadium on match days.
England's cricket players take part in a training session at the National Cricket Stadium in Karachi. AFP
Spectators will have to park at least a mile from the venue and be brought to the stadium in special secure shuttles after undergoing thorough bag and body searches.
Squads for seven-match Twenty20 international series in Karachi and Lahore from September 20 to October 2:
Pakistan: Babar Azam (captain), Shadab Khan, Aamer Jamal, Abrar Ahmed, Asif Ali, Haider Ali, Haris Rauf, Iftikhar Ahmed, Khushdil Shah, Mohammad Haris, Mohammad Hasnain, Mohammad Nawaz, Mohammad Rizwan, Mohammad Wasim, Naseem Shah, Shahnawaz Dahani, Shan Masood, Usman Qadir
England: Jos Buttler (capt), Moeen Ali, Harry Brook, Jordan Cox, Sam Curran, Ben Duckett, Liam Dawson, Richard Gleeson, Alex Hales, Tom Helm, Will Jacks, Dawid Malan, Adil Rashid, Phil Salt, Olly Stone, Reece Topley, David Willey, Chris Woakes, Luke Wood, Mark Wood
Chasing 201, Pakistan got off to a decent start as the openers Mohammad Rizwan and Babar Azam shared a half-century partnership for first wicket.
Babar Azam led from the front as Pakistan beat England by 31 runs in the first Twenty20 international at Trent Bridge on Friday despite a blistering hundred from Liam Livingstone.
Spectacular clashes are on the cards as the International Cricket Council (ICC) announced the draw for the Twenty 20 World Cup in which arch rivals India and Pakistan have been drawn in the same group.
Mohammad Hafeez was the top scorer with a 62-ball 84 as Babar Azam (63 off 66) and captain Sarfraz Ahmed (55 of 44) also scored half centuries. England will need to pull off the highest successful run chase in World Cup history if they are to win this game.
The Games, delayed a year due to China's measures to combat the COVID-19 pandemic, will be the country's biggest sporting event in over a decade in several metrics, with around 12,000 athletes from 45 nations competing in 40 sports.
India have become only the second team in men's cricket history to occupy the number one spot across all three formats after defeating Australia in the first ODI on Friday.
The prestigious championships for amateurs and professionals will take place under the patronage of Sheikh Mohammed Bin Hamad Bin Mohammed Al Sharqi, Crown Prince of Fujairah, and will be held at the Zayed Sports Complex.
The total prize money pool is $10 million for the tournament, the same which was given in the 2015 and 2019 editions of the competition. The runners-up of 2023 Men’s ODI World Cup will receive $2 million, while the losing semi-finalists will get $800,000 each.