The 21-year-old defender has left Scottish giants Celtic and joined their Scottish Premiership rivals Motherwell.
Chalmers came through Celtic’s youth academy, but he struggled to play regularly in the Bhoys’ first team.
The Scotland Under-21 international could make just two appearances in the Scottish Premiership for the Hoops.
Fellow left-back Robertson, now 21 and a full Scotland international, was released by Celtic back in 2009 because, according to The Sun, he was considered to be too small.
Chalmers has now revealed that his former Bhoys teammate wished him well on his switch from Celtic to Motherwell.
“Andy and I played in the same Celtic team,” the youngster told The Scottish Sun. “We are still good mates and my mum and his mum still chat to one another.
“To have gone all the way to the full national team is brilliant and it shows that sometimes when you take a step back you then begin to move forward.
“He texted me last night when he heard about the move just to wish me luck. He thinks it will be a good move for me and I am just really looking forward to trying to play first-team football every week.”
However, the 21-year-old Scotland international could find himself playing for a top-flight club next season, as Aston Villa are reportedly interested in him.
According to The Birmingham Mail, Tim Sherwood’s team want to sign the former Dundee United left-back in the summer transfer window.