The first leg will take place on Thursday, August 22 at Stamford Bridge, with the two-match winner qualifying for the stage.
Chelsea faced Braga or Servette in the Europa Conference League organizational level play-off.
The first leg will take place on Thursday 22 August at Stamford Bridge, with Enzo Maresca’s Blues traveling to Portugal or Switzerland a week later.
Chelsea, who finished sixth in the Premier League last season, were denied a Europa League spot after eighth-placed Manchester United beat Manchester City to win the FA Cup.
Braga, who finished fourth in the Portuguese First League last season, will face Servette, third in the Swiss Super League, on Thursday and seven days later.
On the other hand, Rangers will face either Red Bull Salzburg or FC Twente for a place in the Champions League organisational phase.
The Scottish giants will face the winner of the clash between the 17-time Austrian champions and the Dutch in the competition’s play-offs, if they manage to beat Dinamo kyiv first.
Philippe Clement’s men will face 16-time Ukraine champions Dynamo in the third qualifying round on Tuesday in Lublin, Poland, before next Tuesday’s second leg takes place at Hampden Park due to ongoing renovation works at Ibrox.
The first leg against Salzburg or Twente would be played at home on August 20 or 21, and the second leg on August 27 or 28.
Rangers have avoided a conceivable showdown with Jose Mourinho’s Fenerbahce in Monday’s draw in Nyon, Switzerland.
Mourinho, former coach of Chelsea, Real Madrid and Manchester United, will play his first season in Turkey after his appointment in June.
Their new rival will face Czech Slavia Prague or Belgian Union Saint-Gilloise.
In the Europa League, Hearts faces the winner of the third qualifying round between Ukrainian side Kryvbas Kryvyi Rih and Czech club Viktoria Plzen.
The Jambos, who finished third in the Scottish Premiership last season, were eliminated in the first leg.
Welsh champions The New Saints will face the losers of the Champions League qualifying match between Azerbaijani club Qarabag and Bulgarian club Ludogorets, if they beat Moldovan Petrocub.
If the Saints go through Petrocub, they will participate in the Europa Conference League play-offs against the Lithuanian club FK Panevezys or Maccabi Tel-Aviv of Israel.
Shamrock Rovers, the reigning Ireland League champions, who will first have to face Slovenian side NK Celje, will potentially face either Malmö or Greek PAOK in the Europa League play-offs.
A defeat by Rovers Celje would allow them to face FC Ordabasy of Kazakhstan or FC Pyunik of Armenia in the Europa League play-offs.
Meanwhile, Scottish clubs St Mirren and Kilmarnock have revealed their potential sides in the Europa Conference League play-offs.
Saints will face the winner of the draw between Romanian club Corvinul 1921 Hunedoara and FC Astana of Kazakhstan if they beat Brann first, while Killie’s praise if they eliminate Tromso will be a showdown with either Danish club FC Copenhagen or Czech club Banik Ostrava.
In the same competition, Northern Ireland’s Larne will face Dinamo Minsk of Belarus or Lincoln Red Imps of Gibraltar, if they beat Kosovar club Ballkani first.
Irish St Patrick’s Athletic will face Georgia’s FC Iberia 1999 or Turkish side Istanbul Basaksehir if they beat Azerbaijan’s FC Sabah.