Celtic is engaged in discussions to bring back former defender Kieran Tierney, who currently plays for Arsenal, on a pre-contract deal. The 27-year-old Scotland international could leave Arsenal following an injury-riddled stint since joining in 2019. Despite interest from multiple European clubs, it’s uncertain whether Arsenal will permit a loan move in January. Tierney, who has made 125 appearances for Arsenal and faced several significant injuries, is regarded positively in London.