Chelsea manager Guus Hiddink said he was aware that Eden Hazard swapped shirts with Paris Saint-Germain's Angel Di Maria at half-time of their Champions League round-of-16 second-leg match and said "it should not be done."
PSG and Chelsea were drawing 1-1 on the night as the teams we into the break at Stamford Bridge, with the visitors holding the upper hand thanks to a 2-1 first-leg win when the teams met at the Parc des Princes two weeks ago.
Hazard, who has been under pressure this season due to a lack of form, exchanged shirts with Argentine Di Maria as the two made their way to the dressing room at half-time.
Hiddink said he did not approve of the move, but refused to condemn the Belgian.
"I'm aware. It should not be done," the Dutchman said. "But in some countries it's usual that you do it [at half-time] and not after the game. Maybe they're both used to doing that.
"Don't overvalue this issue."
- BT Sport Football (@btsportfootball) March 10, 2016
The Dutch manager also weighed in on the home fans booing Hazard during and after the match, saying: "Yes, they had the right to do what they think. You can express always your feelings.''
Hiddink felt Chelsea showed PSG too much respect early on and were punished when seeking a second goal to level the tie.
"Second half we pushed, we tried to get 2-1 [ahead],'' Hiddink added.
"We were on the edge around 65th minute to score. We didn't do so, and they had an attack and killed the game at that moment.''