Celtic star messages ex teammate.
Liverpool's 3-1 away to Bayern Munich this week was one of those results which makes the whole of Europe sit up and take notice.
Defender Virgil van Dijk was the star, defending like a titan and scoring one of Liverpool's goals.
Van Dijk's former Celtic teammate Mikael Lustig was among those to congratulate him on his performance.
Van Dijk quit Celtic in 2015 after the club were eliminated from the Champions League qualifiers by Malmo.
The Dutchman left Southampton for Liverpool last January for £75 million.
After reaching the Champions League final last year, his side are now into the last eight.
Celtic were knocked out in the qualifiers again this season.
Van Dijk is clearly making his former teammate proud.