Castleford Tigers
On 16 April 2024, the Castleford Tigers announced the signing of Senior on an initial two-week loan deal, continuing on a rolling basis. [8] [9] Senior made his debut and scored his first try for the club in a 36-14 loss away at Wigan. [10] A week later, his loan stay was extended until the end of the season. [11] In round 10, Senior scored two tries against Leigh, with the second late on taking the game to extra time. [12] On 22 May 2024, Louis signed a two-year deal to remain with Castleford from the 2025 season alongside his twin brother Innes, who was also at Castleford on loan. [13] However, it was announced the following day that he suffered a ruptured quad and was expected to spend three to four months on the sidelines. [14]
After navigating several setbacks with his recovery, Senior made his return from injury as a late interchange against Salford in May 2025, twelve months on from his injury. [15] He returned to Castleford's starting line-up the following week as a centre and scored his first try of the season against Leeds. [16] In round 14 against Hull, he shrugged off four defenders to score a try and was named in the Super League Team of the Week. [17] [18]
Huddersfield Giants 
Oldham (loan)
Hull Kingston Rovers 
Castleford Tigers