“I have big ambitions for this season and can’t wait to get on the pitch with my new team and start this next chapter.”
United later announced the signing of Press on a similar deal.
The 31-year-old striker, capped 138 times by the national team, has been with NWSL side Utah Royals since 2018.
“I feel blessed to have the opportunity to continue to strive to be my best and to compete for trophies this year,” Press said.
United opened their 2020-21 WSL season with a 1-1 draw against champions Chelsea on Sunday.
The transfer window closes on Thursday.