Lionel Messi made his debut for Paris St Germain on Sunday night in a 2-0 win at Reims.
The Argentine superstar was playing his first game since his high-profile free transfer move from Barcelona.
PSG were two goals up by the time Messi was introduced as a 66th-minute substitute for former Barcelona team-mate Neymar, with Real Madrid target Kylian Mbappe having netted twice as speculation continues to swirl over his own future.
The Argentina international’s arrival was greeted with enthusiastic cheers from the 6,000 travelling fans and while he was unable make an impression on the scoreboard, Pochettino said Messi’s presence had an impact.
“I felt it as soon as he came onto the field and his first touches of the ball,” said Pochettino in quotes reported by L’Equipe.
“He brought a calmness to the team. It’s very important to get off to a good start, even for him.
“He was happy and he is well integrated into the group. It was a question of common sense to give him his debut.”
The six-time Ballon d’Or winner signed a two-year deal in the French capital on August 10 after ending a 21-year spell at Barca, but he had not played since winning the Copa America with Argentina on July 11.
Mbappe opened the scoring after 15 minutes when he got between two Reims defenders to head the ball into the back of the net from a well-weighted Angel Di Maria cross.
With Reims having seen a goal chalked off by VAR, Mbappe added his second three minutes past the hour mark.
Achraf Hakimi broke forward before sending an inch-perfect pass into the path of the French forward, who tapped it home to double his side’s lead.
Messi had to wait 10 minutes after coming on for anything resembling a goalscoring opportunity. The 34-year-old drove forward before passing to Mbappe, but the return pass could not find the Argentinian.
The crowd was a 21,000 sell-out, with reports of tickets being sold on the black market for up to 6,000 euros.