In the English Grammar Profile, B2 point 138 in the category of MODALITY is defined as:
could as the past form of ‘can’ in reported speech
For example:
Victim support arrived at our door and told us that we could expect to write off the next five years to grief.
The following clusters from iWeb were searched with varying the spaces between said|told * * * could
1 SAID HE COULD 13770
1 SAID HE COULD SEE 543
2 SAID HE COULD GET 186
3 SAID HE COULD HEAR 161
4 SAID HE COULD TELL 161
5 SAID HE COULD FEEL 122
6 SAID HE COULD MAKE 120
7 SAID HE COULD UNDERSTAND 97
8 SAID HE COULD HELP 93
9 SAID HE COULD GO 86
10 SAID HE COULD TAKE 74
11 SAID HE COULD FIND 67
12 SAID HE COULD FIX 55
13 SAID HE COULD GIVE 55
14 SAID HE COULD SMELL 52
2 SAID THEY COULD 7342
3 SAID IT COULD 7171
4 SAID I COULD 6065
5 SAID SHE COULD 5581
1 TOLD ME I COULD 3005
2 SAID THAT HE COULD 1698
2 TOLD ME THAT I COULD 1067