Yes, you can do that (assuming that your W-2 shows at lease that much in box 1 to support an IRA contribution). Because the excess contribution was ineligible for rollover, the excess contribution to the 401(k) became an ordinary contribution to the traditional IRA when deposited into the traditional IRA. You would report that as a traditional IRA contribution the same as if the excess (and attributable earnings) had been distributed to you and you used the cash to make the deposit to the traditional IRA.
Unless the 401(k) plan issued Forms 1099-R that already reflect a return of the excess contribution, the (probably code G) Form 1099-R reporting the rollover from the 401(k) does not reflect what actually happened, so corrected of substitute Forms 1099-R will need to be entered such that what is reported with code G is only the portion that was actually eligible for rollover. The rest would be reported as a taxable distribution(s). If the Net Attributable Earnings on the excess was positive and distributed in 2025, that portion would be reported on your 2025 tax return.
