Mumbai, April 24: Mumbai Indians head coach Mahela Jayawardene clarified on April 24 that New Zealand all-rounder Mitchell Santner was taken for a medical scan after complaining of dizziness following a diving catch attempt, which is why Shardul Thakur was brought in as a concussion substitute during MI's chase against Chennai Super Kings (CSK) in the Indian Premier League (IPL) 2025. The decision sparked widespread debate as Shardul was not part of the original playing XI.

What Happened to Santner on the Field

Mitchell Santner was seen walking off the field clutching his shoulder after sprinting in from sweeper cover to complete a stunning diving catch that dismissed Kartik Sharma. Slow-motion replays clearly showed the Kiwi all-rounder's head making contact with the ground during the effort.

Once Santner returned to the dressing room, he reported feeling unstable and dizzy — a key clinical indicator consistent with a potential concussion. The team's medical staff immediately took him for a scan to assess his condition before any further decision was made.

Jayawardene's Explanation of the Concussion Substitute Decision

Addressing the media in the post-match press conference, Jayawardene provided a detailed account of the sequence of events. "He hit his head first, neck, obviously the shoulder as well. He went for a scan because once he got back, he felt dizzy. So, he was lying down. Yes, the ice was there for the shoulder. But he felt that he wasn't stable. So, we took him for a scan in that situation. We requested a concussion substitute," Jayawardene said.

He further noted that the final call rested with the match officials. "Obviously, it is at the match referee and the umpire's discretion. They allowed Shardul. Mitch will be disappointed that his batting powers are matched to Shardul Thakur. But it is what it is. But hopefully, it's not too bad," the MI head coach added.

Under IPL and ICC concussion substitute protocols, a replacement player must be a like-for-like substitute as assessed by the match referee. The approval of Shardul — a lower-order batting all-rounder — as a replacement for Santner, who bats in a similar position, was deemed appropriate by the on-field officials.

Impact Player Substitution and Tactical Context

The situation became more complex given that MI had already used their Impact Player substitution during the match, bringing in opener Danish Malewar in place of AM Ghazanfar. With the chase stalling badly, Shardul Thakur walked in to bat at No. 8 as the concussion substitute, a move that raised eyebrows across cricketing circles and social media.

Critics questioned whether the concussion substitute rule was being stretched tactically, though Jayawardene's account of Santner's medical condition — dizziness and instability requiring a scan — aligns with the legitimate application of the protocol. The match referee's approval further legitimises the substitution.

Allah Ghazanfar's Bright Spot Amid Heavy Defeat

Despite suffering one of their heaviest defeats in T20 history — their biggest loss by runs — Mumbai Indians found reason for optimism in the bowling performance of young Afghan spinner Allah Ghazanfar. The teenager returned impressive figures of 2 wickets for 25 runs in his 4 overs, effectively putting the brakes on CSK's scoring rate during the crucial middle overs.

Jayawardene was effusive in his praise for the youngster. "Allah Ghazanfar bowled well. He is very brave and maturing with time. The more games he plays in the middle, he will learn a lot. We, as a unit, will keep backing him to do what he does best," the MI coach said.

Ghazanfar's continued development is being closely watched as one of IPL 2025's most exciting emerging talents, with his ability to contain and take wickets in the powerhouse CSK lineup signalling a promising future at the highest level.

Broader Implications for Concussion Protocols in IPL

This incident once again brings the spotlight onto how concussion substitute rules are applied in the IPL, particularly the like-for-like assessment process. While the rules are designed to protect player safety, the opacity around medical decisions during live matches often fuels speculation and controversy among fans and analysts.

As IPL 2025 progresses, Mumbai Indians — currently under pressure in the points table — will be closely monitoring Santner's recovery ahead of upcoming fixtures. A fit and firing Santner is critical to MI's bowling balance, and his availability in the next match will be a key talking point in the days ahead.