Stuart Lancaster's presence at the AJ Bell stadium will not have gone unnoticed by Cipriani, who had to battle through tough conditions on a night which didn't favour the kickers.
Diamond said that the fly halves' contribution was excellent, but was also quick to add that Sale's star man's recent upturn in form is down to a strong team spirit.
"There's a lot of press about Danny at the moment. He's playing well because he is playing for the team.
"As he's matured he's realised that his individual brilliance, as we saw with some of his kicks and offloads, is great when combined with a team ethic."
He was quick to add though that any talk of Cipriani joining the international fold once again would be premature, adding that the 26-year-old would have to concentrate on keeping up his good form for the Sharks before thinking about an England call up.
"We don't want to start talking about him playing for England just yet. If the opportunity comes in the Six Nations brilliant, if it doesn't, there's a summer tour," he said.
Battling through horrendous conditions on the night, Cipriani was able to recover from an early mistake to control a tough, bruising encounter.
Kicking the ball straight out from kick off was not the start he would have planned for, though Diamond was pleased with how quickly the former Wasps man was able to recover.
"Danny played really well. He had a rough start. He kicked the ball long in difficult conditions, but the difference with him now rather than when he was playing elsewhere is that he's consolidated his game a little bit more.
"The game wasn't really anything for players outside the number nine. You've got to get your pack into the game and keep the ball and Danny managed to do that for us."
Despite his terrific form of late, Cipriani also had a slice of luck on his side against Irish, as his speculative chip in behind the opponent's defence fortuitously bounced over the head of full back James O'Connor to gift Tom Brady a score.
Diamond was still full of praise for Cipriani's willingness to take a chance, saying his opportunism had helped in the scoring of the try.
"Where Danny was really good was spotting that we had a penalty for the first try. Danny realised that and put in that chance kick, which got a fortunate bounce but that's what you want on a wet and windy night."