The Rams captain and Trundle were at Bristol City and the latter loved his ex-colleague's display against the Whites at Elland Road.
The Rams captain impressed at Elland Road as Frank Lampard's side became the first team to reach the second-tier final after having lost the first leg at home.
Stuart Dallas tapped home in the 24th minute after Liam Cooper's header had hit the post, but Jack Marriott levelled from a mix-up between Cooper and goalkeeper Kiko Casilla.
Mason Mount and Harry Wilson turned the tie on its head and, even though Dallas levelled the tie on aggregate, Marriott's second proved enough to see Derby through to the final 4-3 on aggregate.
Trundle, who was on the books of Bristol City alongside Keogh a decade ago (Soccerbase), had kind words to say about his former colleague on the social media platform:
What a game my old mate Keogh has been different class breaking forward x— Lee Trundle (@LeeTrundle10) 15 May 2019
Keogh has endured his fair share of promotion heartbreak, having finished on the losing side in the 2014 playoff final, missing out on the top six by one point in 2015, almost sealing an aggregate comeback against Hull City in the 2016 semi-finals and relinquishing a 1-0 first-leg lead against Fulham in the 2018 semis.
The 32-year-old will thus be hoping that 2019 will finally be his team's year as they seek to return to the Premier League for the first time in just over a decade, and if he continues to be different class in one or more aspects of his game then it bodes well for the final against Aston Villa.
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