How Do PSG and Barcelona's Unbeaten Runs Match Up to Europe's Best?

With Barcelona setting a club-record unbeaten streak of 29 games on Wednesday and Paris Saint-Germain's continued dominance of Ligue 1, a few have started to wonder how far the European giants could take their winning runs.

Luis Enrique's side extended their run with a 1-1 draw against Valencia in the Copa del Rey on Wednesday, a stretch that has included just 15 league games—and is dwarfed by PSG's 34-game undefeated spell in the French first division.

But even Laurent Blanc's men have a mighty task ahead of them if they're to step into Europe's elite as far as domestic invincibility is concerned.

UEFA.com recently compiled a list of the best unbroken league stretches in history, and even PSG have another 21 games to go before they can match the feats of Porto (between 2010 and 2012) and Shakhtar Donetsk (2000 and 2002).

AC Milan's 58-game unbeaten streak in the early 1990s comes in at joint-eighth. The UK's best representative isn't Arsenal's Invincibles of 2003 to 2004, who went 49 games without defeat in the league, but Celtic for their 62-game streak from 1915 to 1917.

But even that mighty Celtic team has little on the No. 1, Steaua Bucharest, who went a ridiculous 106 games undefeated between 1986 and 1989.

Alberto Saiz/Associated Press

To put that into context, PSG would have to remain undefeated in Ligue 1 until midway through the 2017-18 season to match the Romanian side, while Barcelona would likely be just about wrapping up their fourth consecutive Primera Division title in order to overtake Bucharest.

Good luck, Luis Enrique.

Longest European Unbeaten Streaks, per UEFA.com:

1. 106 games: Steaua Bucharest (1986-89)
2. 63 games: Sheriff (2006–08)
3. 62 games: Celtic (1915–17)
4. 61 games: Levadia Tallinn (2008–09)
5. 60 games: Union Saint-Gilloise (1933–35)
6=. 59 games: Shirak (1993-95), Pyunik (2002-04)
8=. 58 games: AC Milan (1991-93), Olympiakos (1972-94), Skonto (1993-96)
11. 56 games: Benfica (1976-78)
12=. 55 games: Porto (2010-12), Shakhtar Donetsk (2000-02)

[UEFA.com]