On 3 August 2015, after limited opportunities with the Sea Eagles, Chee Kam signed a 1-year contract with the Wests Tigers starting in 2016. After being told he was unwanted by Manly, he played 4 games for them towards the end of the season. He said, "I didn't think they were going to give me those games that I played at the end after they told me that, so I was pretty happy with those couple of games that I got. I used that to build my confidence and get some experience playing at the top level."
2016
In Round 9, Chee Kam made his Tigers debut against the South Sydney Rabbitohs. On 25 May, he re-signed with the Tigers on a 1-year contract.
2017
With Tim Simona de-registered by the NRL and Jamal Idris lacking the fitness to play 80 minutes, Chee Kam was named at centre for the opening rounds of the season. He said, "I remember when I was on the fringes and seeing a couple of boys come off I would get a little opportunity and you have to make the most of it. I'm trying to feed off that. This is a small opportunity to hold this position and I need to make the most of it." In April, Chee Kam extended his contract to the end of the 2019 season, saying, "I feel like I've made a family here, I'm really close with all the boys and have made some great friendships and it's exciting to know I'll be here for a while longer. I want this to be my last club and I'm really grateful and blessed to have been given this opportunity." With further injuries to players, Chee Kam remained in first grade for most of the season, playing 22 games. In round 13, he scored his first try in the match against the St. George Illawarra Dragons.
2018
Chee Kam was again a regular in first grade in 2018, mostly playing from the bench. Towards the end of the season, he spent some time in the starting team. Playing on the left age after an injury to Chris Lawrence, he was averaging 120 metres with the ball and 34 tackles per game in this period.
2019
In Round 5 against the Brisbane Broncos, Chee Kam scored the match winning try for the Tigers as they won the game 22-16 at Suncorp Stadium. Chee Kam had run from in-field with a minute remaining and proceeded to beat five Broncos players to score next to the posts. In Round 15 against South Sydney, Chee Kam scored the winning try for Wests in the final 3 minutes of the game in the club's 14-9 victory at the new Western Sydney Stadium. Chee Kam played 22 games for Wests in the 2019 NRL season as the club finished ninth on the table and missed out on the finals. Wests had the chance to finish as high as seventh on the table but lost their final game of the season against Cronulla at Leichhardt Oval.
2020
In round 11 against Parramatta, Chee-Kam was taken from the field on a stretcher and sent to hospital after being knocked out attempting to tackle one of the Parramatta players. Chee-Kam was then seen shaking on the ground after apparently suffering a seizure. Wests would go on to lose the match 26-16 at Bankwest Stadium.
Assault charge
On 3 January 2019, Chee Kam along with another man was charged by police for assaulting an Uber driver at Bondi Beach in Sydney's Eastern Suburbs. The alleged incident happened on Sunday 30 December 2018 at 10:30PM. Chee Kam and the other man allegedly punched the driver multiple times through the driver's side window. On May 1, 2019, Chee Kam pleaded guilty to common assault. Chee Kam was subsequently suspended for two matches by Wests Tigers and fined an undisclosed amount.
