The Chennai team had won the match 1-0 on December 28.
The suspension comes into immediate effect, the ISL said in a statement.
All India Football Federation's disciplinary committee found Gregory in breach of Article 50 (misconduct against match officials) and Article 58 (offensive behaviour and fair play) for his offensive remarks against the referee during the match against Jamshedpur FC at JRD Tata Sports Complex, the statement added.
Matias has also been fined Rs three lakh and Sehnaj Singh Rs two lakh, the statement said.
The AIFF disciplinary committee found Matias and Sehnaj Singh in violation of Article 48 (serious infringement) and and Article 49 (misconduct against opponents or persons other than official) during the match between Mumbai City FC and Delhi Dynamos in Mumbai on December 29.
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