Linfield will face either Croatian club Lokomotiv Zagreb or Greek side Paok next if they beat Spartak Trnava in the Europa League Second Qualifying round.
The Blues trail the Slovakians 2-1 heading into next Thursday's second leg at Windsor Park.
Zagreb beat Paok 2-1 in their first leg in Croatia on Thursday night.
In the Champions League Crusaders will face Ludogorets or Moldovans Milsami Orhei if they overturn their 4-1 first-leg deficit against Skenderbeu Korce.
However, the Irish Premiership champions will have a mountain to climb in next Tuesday's second leg against the Albanian outfit at Seaview.
Bulgarian club Ludogorets recently appointed former Northern Ireland and Glentoran striker Andy Smith as their assistant manager.
However, the Bulgarians will have it all to do to progress to the Champions League third qualifying round after losing their home leg 1-0 against Milsami Orhei on Thursday.
Meanwhile, Warren Feeney lauded Linfield's display in their 2-1 defeat in Slovakia on Thursday but said his team had deserved even better.
Feeney felt Trnava's first-half penalty should not have been awarded and was angered by Chris Hegarty's second-half effort being disallowed for offside.
"It was never in a million years a penalty," Feeney told the Linfield website.
"And I don't know how he has given offside for Chris Hegarty's header."
Blues keeper Ross Glendinning was adjudged to have brought down Martin Mikovic in the penalty incident while Hegarty's headed effort was ruled out in the 80th minute.
However despite his annoyance about the two controversial decisions, Feeney heaped praise on his team of largely part-timers for their "heroic" efforts against the Slovakian full-time outfit.
"In the first 10 minutes, they had the chances and Ross Clarke had to clear off the line.
"But after that, we dug in and were absolutely outstanding and with a little bit more luck, we could have won the game."
The home side played the entire second half with 10 men after Milos Nikolic was sent off following a second yellow card but Feeney insisted that this shouldn't detract from his team's display.
"Whether they are down to 10 men or not, they are a full-time team and they are the biggest supported club in the country."
Recent signing David Kee got Linfield on terms in Thursday's game by firing in a magnificent free-kick after Martin Mikovic had put Trnava ahead and Feeney described the former Ballinamallard man's strike as "inch perfect".
"David's got that in his locker. He's a very, very good footballer. If you saw that kind of thing in the Premier League, you'd be talking about it."