Arne Engels penned a classy parting message to Celtic after his £22 million transfer to West Ham United.
Engels joined the English Championship outfit on Saturday evening, ending his two-year spell in Glasgow's East End.
The midfielder recorded 100 Celtic appearances and won two Scottish Premiership titles, one Scottish Cup, and one League Cup.
After his move to West Ham was confirmed, Engels wrote on Instagram: "After two incredible years, it's time for me to say goodbye to Celtic.
"I'm leaving with nothing but gratitude for the time I've had at this club. I've experienced so many special moments, lifted trophies, created unforgettable memories and had the honour of representing Celtic.
"Wearing this shirt and playing in front of the supporters has been a privilege I'll always be grateful for. I'll look back on my time here with great pride and carry these memories with me for the rest of my career.
"Thank you to my teammates, the staff, everyone at the club and, of course, the supporters for making these two years so special. Thank you for everything, Celtic."
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On Friday, Celtic manager Martin O'Neill outlined the profile he wants to sign in place of the now departed Belgian.
O'Neill explained: "We always felt that if Arne left, we would be looking for a box-to-box midfield player with real physicality. And that is something we would still look at."
Celtic have until 11pm on Tuesday evening to register two new players in time for their crucial Champions League playoff tie against LASK.
