Before coming to Chennai, Joachim played for English club Kidderminster Harriers. He spent most of his playing days in France including a long spell with Nancy, a press release said here.
The Frenchman also played for English League side Carlisle United.
He offers attacking options to the Chennai City team along with Amirov, who has been part of the Kyrgyzstan national team for more than 10 years.
Amirov had a recent stint with East Bengal, which the club felt could help during the ISL.
The team had finished eighth in the 2016-17 edition of ISL.