Doyle, a 6-foot-4 center back from Ohio State, was selected in the fourth round of the MLS draft last month and faced long odds with a returning corps of Bobby Boswell, Steve Birnbaum, Kofi Opare, Jalen Robinson and, in a pinch, midfielder Markus Halsti. Tornaghi lost out to trialist Chris Konopka, who is seeking to join Andrew Dykstra and Travis Worra on the active roster while starter Bill Hamid recovers from knee surgery.

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Trialists surviving the cut were Konopka; second-round draft pick Paul Clowes, a defensive midfielder from Clemson; Pittsburgh Riverhounds attacker Rob Vincent; former University of Maryland midfielder Paul Torres, who had been playing in Scandinavia; Konstantine Kolokotronis, a U.S. midfielder with Greek league experience; and forward Andrea Mancini, the 23-year-old son of Inter Milan Manager Roberto Mancini who most recently served with a Hungarian club.

It’s unclear whether additional players would be released — or newcomers added — before the second stage of camp opens Thursday in the Tampa area. United will play three friendlies — against the Tampa Bay Rowdies, Philadelphia Union and Montreal Impact — before heading to Mexico to face Queretaro in the first leg of the CONCACAF Champions League quarterfinals Feb. 23. The home leg is March 1. The league opener is March 6 at Los Angeles.

During the first stage of camp, United played two friendlies against Swedish clubs in Bradenton, Fla., losing to Elfsborg, 1-0, and drawing with Jonkopings Sodra, 2-2. Friday’s match against Norway’s Brann was cancelled.

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Defender Steve Birnbaum will report to camp for the first time next week after completing U.S. national team duty in California tonight.

United continues to pursue potential impact players from overseas, most notably AC Milan midfielder Antonio Nocerino.

The current roster:

Goalkeepers: Bill Hamid, Andrew Dykstra, Travis Worra, Chris Konopka*.

Defenders: Bobby Boswell, Steve Birnbaum, Kofi Opare, Sean Franklin, Taylor Kemp, Chris Korb, Jalen Robinson, Luke Mishu.

Midfielders: Nick DeLeon, Lamar Neagle, Patrick Nyarko, Davy Arnaud, Markus Halsti, Marcelo Sarvas, Miguel Aguilar, Jared Jeffrey, Collin Martin, Julian Buescher, Paul Clowes*, Rob Vincent*, Paul Torres*, Konstantine Kolokotronis*.

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Forwards: Chris Rolfe, Fabian Espindola, Alvaro Saborio, Conor Doyle, Andrea Mancini*.

*trialist

United will fill between 18 and 20 senior roster positions and up to eight supplementary slots. That latter group would include homegrown players who are exempt from the salary cap (Robinson and Martin), Generation Adidas signings who are exempt (Buescher) and younger players, such as Worra, Mishu, Aguilar and perhaps Clowes.