Hall, 30, was with the Dynamo from 2009 through 2014, starting 130 league matches and posting 35 shutouts. He was among the best in MLS and received U.S. national team call-ups, though he did not appear in any matches.

Hall suffered an ACL injury late in the 2014 season and last year joined expansion Orlando, where he started 23 games in 2015 before tearing meniscus in the same knee. Orlando did not exercise the option on his contract.

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When United’s starter, Bill Hamid, underwent knee surgery this preseason, Hall was among several replacement options. His injury layoff, however, led the club to look at other candidates. Andrew Dykstra, in his fifth season in Washington, inherited the top job. Meantime, the club signed U.S. under-23 national team goalie Charlie Horton, formerly with English club Leeds United.

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Hall, who is from the Seattle area, worked out with the Sounders in preseason, then joined United for a tryout.

After starting the regular season opener at Los Angeles, Dykstra underwent surgery for a herniated disk. Worra, who is 22 and spent much of his rookie season with the third-division Richmond Kickers, conceded one goal over his first two MLS starts but three against FC Dallas last weekend.

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Hamid, an MLS star and U.S. national team prospect, is expected back as early as mid-May. Dykstra is out until at least June.

Hall earned more than $200,000 last year but signed with United for considerably less, multiple sources said. Per club policy, contract specifics were not disclosed.

So United’s goalkeeping corps now looks like this:

1. Travis Worra (three career MLS starts, all this spring)

2. Tally Hall (new signing, eighth MLS season)

3. Charlie Horton (no appearances since November with U.S. under-23 national team)

4. Bill Hamid (five-year starter out since January with knee injury)