Loosehead prop Jamie Jack and academy hooker Patrick Harrison have both moved to the Exiles club from Edinburgh.
Jack joined Edinburgh from Ampthill last May as front-row cover. He had been due to move north in the summer but the deal was brought forward after a number of injury issues at the capital club. He featured in last month’s pre-season friendly against London Scottish.
Harrison, who has played four times for Edinburgh, has been with Watsonians in this season’s Super6 but will now head south having last season joined Wasps in a similar short-term loan.
Trotter, the former Scotland Under-20 winger, came through the Glasgow Warriors academy and played Super6 for Stirling County. He spent pre-season training with the Warriors but it was announced last week that he had left to pursue new opportunities.
Edinburgh, meanwhile, have announced their touring party to South Africa for the United Rugby Championship games against Bulls and Stormers.
Head coach Mike Blair has taken a 34-man squad for the two-week tour which kicks off against the Bulls this Saturday in what is the capital side’s first-ever match at Loftus Versfeld Stadium in Pretoria.
They then move to Cape Town to face the Stormers on October 1.
Edinburgh Rugby squad for South Africa
Forwards: Lee-Roy Atalifo, Nick Auterac, Dave Cherry, Luke Crosbie, Luan de Bruin, Grant Gilchrist (cc), Nick Haining, Viliame Mata, Adam McBurney, Stuart McInally, WP Nel, Pierce Phillips, Jamie Ritchie (cc), Pierre Schoeman, Sam Skinner, Marshall Sykes, Boan Venter, Hamish Watson, Glen Young.
Backs: Mark Bennett, Jack Blain, Matt Currie, Chris Dean, Darcy Graham, Damien Hoyland, Henry Immelman, Blair Kinghorn, James Lang, Harry Paterson, Henry Pyrgos, Charlie Savala, Charlie Shiel, Jaco van der Walt, Ben Vellacott.