Tatsuhiro Sakamoto opened the scoring before Taiwo Awoniyi doubled Coventry City's advantage. Jack Rudoni added a third shortly after half-time, with Enzo Le Fée converting a penalty for Sunderland, who were unable to mount a comeback.
Lampard was particularly pleased with the contribution of Victor Torp, who was rewarded with his first Premier League start after impressing in training.
“There's two things. There's my opinion of players to select, when I'm thinking about the squad and how we have to use the squad, and sometimes to bring in freshness is a good thing.
“The issue for us is sometimes some of our players have not played in the Premier League, they're desperate to but they're learning as they go and this is the highest level, and some players that come into the club need to adapt a little bit.
“Sometimes you feel ‘OK now they're more ready’ and you want to get them into the team. After last week I felt it was the right time to do that.
“And also players that train at a level that says ‘put me in the team’ and when I think of that, I'm talking predominantly about Victor Torp because he's been training at such a level, with a great professionalism about him, that's a real example. I'm very, very happy for him today because I thought he played great.”
Lampard was equally satisfied with the collective display, particularly the variety Coventry demonstrated in their attacking play.
“I'm very happy. I think the performance was good, the energy was good, the quality.
“I think we had good variation in our game. It showed, I think, in the goals we scored in terms of we could play and play well from the back and we also could be direct and effective in our game, which is us at our best. Similar to how Sunderland play in a sense.
“The energy we brought and the positive feeling in the performance rubbed off on the stadium, allowed us to get ourselves in front in the game.
“Of course they get the penalty and score, but even then I think we continue to see out the game in a very professional manner. So I'm very happy with everything.”
Le Bris, meanwhile, was unhappy with Sunderland's defensive errors, believing his team had surrendered control through avoidable mistakes.
“We gave two opportunities from two unforced errors.
“We changed the momentum of the game and after that we had good spells and created chances.
“But this inconsistency is not acceptable at all. Consistency is the key word in this league. If you keep making individual mistakes, the opponent will kill you.”
The Sunderland manager also acknowledged that his side must improve its defensive organisation and ability to control matches.
“We want to have good control of the game, but it's not possible for different reasons. Maybe we're a bit too exposed or not solid enough in different areas of the pitch.
“We won't give up. We're trying to find solutions.
“We don't look for excuses. We want to assume the reality and work hard. I'm still combative with the players, and we have to get better through consistency.”