The Blues went in at the break drawing 0-0 with their Championship opposition.
Chelsea failed to adequately threaten Preston during the first half, with Pochettino letting them know that their performance wasn’t good enough.
Asked if he and his team-mates received the hairdryer treatment at half-time, Colwill told ESPN: “Something like that!
“I think we needed it though, we weren’t good enough, as everyone saw.
“The second half was much better.”
Chelsea finally went ahead on 58 minutes when Armando Broja headed in Malo Gusto‘s cross.
Thiago Silva nodded Cole Palmer‘s corner beyond goalkeeper Freddie Wooman in the 66th minute, with Raheem Sterling scoring a free-kick shortly after.
Enzo Fernandez rounded off the scoring from close range late on to seal a comfortable 4-0 win for the Blues.
On his team-mates’ contributions, Colwill added: “Raheem normally practices free-kicks the day before a game and he always scores.
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“I think he’s scored two now — Newcastle and then today — so from that position, he’s a specialist at free-kicks.
“I love playing with Armando, he’s a great striker and a good mate of mine.
“I always encourage him because I know how good he can be. Today he showed it with his goal.”
Pochettino appeared to be frustrated by Palmer in particular, with the Argentine seen having an animated discussion with the former Manchester City starlet at the end of the match.
Colwill played the full 90 minutes alongside Silva at centre-back, with youngster Alfie Gilchrist on the right of the defence and Malo Gusto on the left.
The Blues will be back in action on Tuesday when they travel to Middlesbrough for the first leg of their Carabao Cup semi-final.
They then return to Premier League action next Saturday with a home assignment against neighbours Fulham.
