The Aston Villa skipper has been enthused by the club's end to the season under Tim Sherwood.
Despite Villa's disappointing 4-0 loss to Arsenal on Saturday, Delph was filled with optimism about the last few months, with Tim Sherwood inspiring the club to 7 wins and 1 draw in 16 games.
"The manager said that we had it in us to cause an upset but we couldn't find the performance," the Villa site quoted the skipper as saying after the Wembley defeat.
"But a few weeks ago we would have snapped your hand off to stay in the Premier League and get to this FA Cup final.
"Now it's important that we get a winning mentality."
Delph was in similarly positive mood when speaking to BBC WM on Monday, when he assured Villa fans that the squad will be much stronger next season, both through the learning experience games like the Cup final bring, as well likely transfer arrivals.
"We'll strengthen, most likely, and have the mentality to push on from this experience," he said.
"I'm 100% certain we'll be a different animal next season."
Delph played a vital part in the club's improvement as Sherwood changed Villa's fortunes after taking over from Paul Lambert, overseeing wins over Spurs in the league and Liverpool in the cup semi-final.
The England international ended the season with 2 goals and 5 assists in 32 games, and will be hoping to feature in his country's international matches against Republic of Ireland and Slovenia this month.