Steve Evans' team held promotion-chasing Middlesbrough to a 0-0 draw at Elland Road on Monday night, and might feel that they could have taken all three points from the encounter.
That stalemate leaves the Yorkshire club with just one win from their last nine Championship matches, but Diagouraga, who has impressed after signing from Brentford in the final week of the January transfer window, is adamant that the results have not matched the performances.
He told the club's website: "We knew before the game that we’re good enough to beat anyone in this league. We showed on Monday night that when we’re on top of our game, we can match anyone.
"We could have won the game. We were the better team in the first half - they did into the game in the second half - but we had enough chances in the end and were unlucky not to win it.
"I’ve been here two or three weeks and I’ve already seen how good the team is. Hopefully we can get some more wins under our belt between now and the end of the season."
Evans' side's poor recent form has taken its toll on their league position, with the club currently languishing in 16th in the Championship table.
However, they are just three points off a place in the top half, and if they can convert some of their good displays into results it may not be too late to start climbing the table towards the play-off positions.
Before that, however, they take a break from league action this weekend to travel to Premier League side Watford in the FA Cup fifth round.