Pat Nevin joined Monday's Off the Ball to look ahead to Chelsea's clash with Barcelona in the Champions League on Tuesday.
Despite being known as an free-flowing attacking side, the Spanish league leaders have only conceded 11 goals in La Liga so far this season.
However, Kevin believes they have one weakness which Antonio Conte's side can exploit.
"They aren't as great a team as they were before," he told Joe Molloy, adding: "because some of the players are a bit older. They have to leave Messi out sometimes and Iniesta doesn't always start.
"In the past it was them who were always fantastic. Looking through that team now - it's still hard to see a great weakness in the squad.
"We talk about them being so creative going forward but do you know how many goals they have lost this season in the league? 11 goals! They've lost one goal in the Champions League. This is supposed to be an open, attack-minded side - they don't give goals away. That's two goals in the last eight hours.
"They're a right good team with one possible weakness."
"It's actually just a positional one - I think right full-back is an area where you can do them. Semedo is out injured - he's the main man there and anyone else that they've tried in those areas - I've looked through all the goals they've lost this season and a quite large percentage of them come from a weakness in that right full-back area."
The full discussion can be heard here:
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