When Minnesota United’s scoring production first slowed in late April, Adrian Heath pointed to the abundance of goals in the season’s first seven games.

As it became a trend in May, the Loons coach pointed to still-consistent chances created.

But as the stagnant pace of goals grinds into June, Heath now acknowledges it’s a concern going into Minnesota’s game against Philadelphia (7-4-4) at 3 p.m. Sunday at Allianz Field. Unbeaten in six home games, Minnesota (6-5-3) welcomes the second-place club in the Eastern Conference.

“We didn’t create an awful lot on Wednesday; that was a bit of a concern,” Heath said of the Loons’ 3-0 loss at Atlanta United. “I don’t think we have looked as sharp going forward the last few weeks, and that has probably showed in the goals-for column.”

After scoring 17 goals in the first seven games, Minnesota has mustered only four in the past seven. United’s defense, which includes four shutouts in the past five home games, has kept the Loons in the MLS Cup playoff race. It has kept at bay a sense of the sky falling because of a lack of goals.

Leading scorer Darwin Quintero has been stuck on five goals for seven games, albeit a few interrupted by an ankle injury, and his scoring drought has reached 452 minutes.

Striker Angelo Rodriguez’s only goal in the last seven games is his claimed deflection off Romain Metanire’s cross in a 1-0 win over D.C. United on April 28. As a sub, he nearly scored on a rebound against Atlanta, but the referees didn’t take a closer replay look to see if the whole ball crossed the line.

Winger Ethan Finlay is the only other attacker to score in this skid, a storybook finish against his former club, Columbus, in a 1-0 win on May 19. Fullback Metanire had the game-winner off a deflected cross in a 1-0 win over Houston on May 25, and center back Ike Opara’s header was the difference in a 1-1 draw with Seattle on May 4.

“We have to believe that the next game is the game they are going to turn it around, and they have to think that,” Heath said. “I would guess that there is nobody with a magic wand out there that is suddenly going to make them feel confident and they are going to score goals. They are going to have to do that by themselves.”

United has been one of worst possession teams in MLS this season. Heading into this weekend’s action, the Loons were 22nd in the 23-team league at 46.6 percent. This contributes to having only 25 percent of their action in the other team’s defensive third of the field; that’s tied for 19th in MLS.

To stir up some offense, Heath has tried alternating players and formations. The club sent Romario Ibarra on loan to Pachuca in Mexico; Kevin Molino has dealt with a hamstring injury; Miguel Ibarra had his own hamstring injury and has fluctuated among fullback, winger and wingback; Abu Danladi has had inconsistent minutes.

“We’ve just got to keep the guys motivated and try to stay positive,” he said Friday. “They have to try to stay positive. We’ve all had a spell where it doesn’t look like you are going to score, and then it suddenly starts to turn for you and you get a little run going.”

But Heath also talked about the possibility of adding an attacker during the summer transfer window from July 7-Aug. 7. The loan of Romario Ibarra and the trade of Francisco Calvo to Chicago freed budget funds and international roster spots.

“Do we change things in the next transfer window?” he asked. “Do we try to add one or two pieces? I think that would be something that we look to do, but this group of players and this group of forwards has proved that they can score in this league this year.”