Minnesota United has signed goalkeeper Alex Kapp off waivers, the team announced Tuesday.

According to the Loons' official Major League Soccer roster, the 22-year-old New York native, who has been training with the team for the past several weeks. is now on the reserve roster.

Fellow expansion team Atlanta United FC drafted Kapp 68th overall in January but didn't sign him. The Creighton and Boston College product joins starter Bobby Shuttleworth and backup Patrick McLain as United's three keepers.

Kapp, at 6-feet, 190 pounds, is the fourth addition to the Loons in the current transfer window. He joins Scottish winger Sam Nicholson, New Zealand defender Michael Boxall and forward Brandon Allen, on loan from the New York Red Bulls.

With the secondary transfer window closing Wednesday, coach Adrian Heath said Tuesday after practice he's "hopeful" to have at least one more addition to the Loons. It's unclear if Kapp was the one to which he alluded.

"We've got one or two things going on internally and externally, and we'll see where that leads us," Heath said. "We're hopeful we'll at least bring one in before the deadline tomorrow evening. To that end, there might be one or two going out as well."

While Boxall and Nicholson have become starters, Allen hasn't seen action since he played in a friendly on July 15, the day he was officially announced. Heath said the score line and momentum of matches has influenced Allen's playing time, as he has been available on the bench but not been substituted.

"This weekend it was, once it went to three-nil ... the game was lost. We were not going to get back in it when it went to 3-nil," Heath said. "If that game had been 2-1, chances are Brandon Allen would have been on the field with us and had an opportunity to try and get a goal because the one thing he's shown since he's been with us, he's really good in and around the box."

The team will practice the Wednesday and then take the rest of this week off, as it won't play again until Aug. 20 at Seattle.

"We've got a really difficult stretch coming up now. Next 11 games, we've got eight on the road," Heath said. "And obviously, it's going to need a different mindset, and that's something we've spoken about. And it will give me an opportunity, I think, to blood some players and give players an opportunity but also maybe to look at one or two tweaks with the system and personnel and shape of the team."

Coach Adrian Heath on what he wants from these next two days of #MNUFC practice (featuring lots of background cameos) pic.twitter.com/DVapU0jrLp — Megan Ryan (@theothermegryan) August 8, 2017