Colwill had already prompted questions earlier in the week when he remained on the bench for the 2-1 Premier League defeat by Arsenal, despite being fit enough to be involved. He returned to the starting line-up against Leeds but was replaced by Wesley Fofana in the 76th minute.
The defender then headed straight down the tunnel, leading to speculation that he had suffered another injury. However, his start against Leeds suggests the problem was limited, with Chelsea seemingly unwilling to take any unnecessary risks once the match had opened up.
Asked if the change was injury-related, Alonso said: "No, no. It is just from little things that he's having, but we don't expect that it's an injury."
Colwill has become an important figure in Chelsea's back line, meaning a further defensive issue would have complicated Alonso's selection options.
The Blues face Premier League fixtures against Hull City and Brentford before the international break, but can now temporarily put their concerns over Colwill's condition to one side.
Matias Fernandez-Pardo is edging closer to a first start for Newcastle, although head coach Matthias Jaissle expects to wait until late before deciding if he'll face Leeds on Monday.
Mauricio Pochettino believes Tottenham should be awarded the 2016/17 Premier League title after Chelsea were punished for financial rule breaches linked to the Roman Abramovich era.
Liverpool goalkeeper Alisson Becker has been fined 8,000 pounds by the Football Association for kicking a substitution board after the Premier League draw with Nottingham Forest.
Morgan Rogers believes Xabi Alonso has made Chelsea an "exciting" team after the Blues continued their impressive start to the season with a 6-3 victory over Leeds in the League Cup on Wednesday.
